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<title>API: element-delegate Element-Delegate.js (YUI Library)</title>
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<h1><a href="http://developer.yahoo.com/yui/" title="Yahoo! UI Library">Yahoo! UI Library</a></h1>
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<h3>Element Event Delegation Module <span class="subtitle">2.8.2r1</span></h3>
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<a href="./index.html" title="Yahoo! UI Library">Yahoo! UI Library</a>
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> <a href="./module_element-delegate.html" title="element-delegate">element-delegate</a>
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> Element-Delegate.js (source view)
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<div class="highlight"><pre><span class="cm">/**</span>
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<span class="cm"> * Augments the Element Utility with a <code>delegate</code> method that </span>
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<span class="cm"> * facilitates easy creation of delegated event listeners. (Note: Using CSS </span>
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<span class="cm"> * selectors as the filtering criteria for delegated event listeners requires </span>
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<span class="cm"> * inclusion of the Selector Utility.)</span>
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<span class="cm"> *</span>
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<span class="cm"> * @module element-delegate</span>
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<span class="cm"> * @title Element Event Delegation Module</span>
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<span class="cm"> * @namespace YAHOO.util</span>
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<span class="cm"> * @requires element, event-delegate</span>
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<span class="cm"> */</span>
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<span class="p">(</span><span class="kd">function</span> <span class="p">()</span> <span class="p">{</span>
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<span class="kd">var</span> <span class="nx">Event</span> <span class="o">=</span> <span class="nx">YAHOO</span><span class="p">.</span><span class="nx">util</span><span class="p">.</span><span class="nx">Event</span><span class="p">,</span>
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<span class="nx">delegates</span> <span class="o">=</span> <span class="p">[],</span>
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<span class="nx">specialTypes</span> <span class="o">=</span> <span class="p">{</span>
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<span class="nx">mouseenter</span><span class="o">:</span> <span class="kc">true</span><span class="p">,</span>
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<span class="nx">mouseleave</span><span class="o">:</span> <span class="kc">true</span>
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<span class="p">};</span>
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<span class="nx">YAHOO</span><span class="p">.</span><span class="nx">lang</span><span class="p">.</span><span class="nx">augmentObject</span><span class="p">(</span><span class="nx">YAHOO</span><span class="p">.</span><span class="nx">util</span><span class="p">.</span><span class="nx">Element</span><span class="p">.</span><span class="nx">prototype</span><span class="p">,</span> <span class="p">{</span>
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<span class="cm">/**</span>
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<span class="cm"> * Appends a delegated event listener. Delegated event listeners </span>
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<span class="cm"> * receive two arguments by default: the DOM event and the element </span>
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<span class="cm"> * specified by the filtering function or CSS selector.</span>
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<span class="cm"> * (Note: Using the delegate method requires the element-delegate </span>
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<span class="cm"> * module. Using CSS selectors as the filtering criteria for delegated </span>
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<span class="cm"> * event listeners requires inclusion of the Selector Utility.)</span>
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<span class="cm"> * @method delegate</span>
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<span class="cm"> * @param {String} type The name of the event to listen for</span>
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<span class="cm"> * @param {Function} fn The handler to call when the event fires</span>
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<span class="cm"> * @param {Function|string} filter Function or CSS selector used to </span>
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<span class="cm"> * determine for what element(s) the event listener should be called. </span>
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<span class="cm"> * When a function is specified, the function should return an </span>
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<span class="cm"> * HTML element. Using a CSS Selector requires the inclusion of the </span>
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<span class="cm"> * CSS Selector Utility.</span>
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<span class="cm"> * @param {Any} obj A variable to pass to the handler</span>
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<span class="cm"> * @param {Object} scope The object to use for the scope of the handler </span>
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<span class="cm"> * @return {boolean} Returns true if the delegated event listener </span>
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<span class="cm"> * was added successfully</span>
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<span class="cm"> * @for Element</span>
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<span class="cm"> */</span>
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<span class="nx">delegate</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">type</span><span class="p">,</span> <span class="nx">fn</span><span class="p">,</span> <span class="nx">filter</span><span class="p">,</span> <span class="nx">obj</span><span class="p">,</span> <span class="nx">overrideContext</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">if</span> <span class="p">(</span><span class="nx">YAHOO</span><span class="p">.</span><span class="nx">lang</span><span class="p">.</span><span class="nx">isString</span><span class="p">(</span><span class="nx">filter</span><span class="p">)</span> <span class="o">&&</span> <span class="o">!</span><span class="nx">YAHOO</span><span class="p">.</span><span class="nx">util</span><span class="p">.</span><span class="nx">Selector</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">YAHOO</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s2">"Using a CSS selector to define the filtering criteria for a delegated listener requires the Selector Utility."</span><span class="p">,</span> <span class="s2">"error"</span><span class="p">,</span> <span class="s2">"Element"</span><span class="p">);</span>
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<span class="k">return</span> <span class="kc">false</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">Event</span><span class="p">.</span><span class="nx">_createDelegate</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">YAHOO</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s2">"Using delegate functionality requires the event-delegate module."</span><span class="p">,</span> <span class="s2">"error"</span><span class="p">,</span> <span class="s2">"Element"</span><span class="p">);</span>
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<span class="k">return</span> <span class="kc">false</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="kd">var</span> <span class="nx">sType</span> <span class="o">=</span> <span class="nx">Event</span><span class="p">.</span><span class="nx">_getType</span><span class="p">(</span><span class="nx">type</span><span class="p">),</span>
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<span class="nx">el</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="s2">"element"</span><span class="p">),</span>
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<span class="nx">fnDelegate</span><span class="p">,</span>
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<span class="nx">fnMouseDelegate</span><span class="p">,</span>
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<span class="nx">fnWrapper</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">return</span> <span class="nx">fnDelegate</span><span class="p">.</span><span class="nx">call</span><span class="p">(</span><span class="nx">el</span><span class="p">,</span> <span class="nx">e</span><span class="p">);</span>
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<span class="p">};</span>
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<span class="k">if</span> <span class="p">(</span><span class="nx">specialTypes</span><span class="p">[</span><span class="nx">type</span><span class="p">])</span> <span class="p">{</span>
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<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">Event</span><span class="p">.</span><span class="nx">_createMouseDelegate</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">YAHOO</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="s2">"Delegating a "</span> <span class="o">+</span> <span class="nx">type</span> <span class="o">+</span> <span class="s2">" event requires the event-mouseleave module."</span><span class="p">,</span> <span class="s2">"error"</span><span class="p">,</span> <span class="s2">"Element"</span><span class="p">);</span>
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<span class="k">return</span> <span class="kc">false</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="nx">fnMouseDelegate</span> <span class="o">=</span> <span class="nx">Event</span><span class="p">.</span><span class="nx">_createMouseDelegate</span><span class="p">(</span><span class="nx">fn</span><span class="p">,</span> <span class="nx">obj</span><span class="p">,</span> <span class="nx">overrideContext</span><span class="p">);</span>
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<span class="nx">fnDelegate</span> <span class="o">=</span> <span class="nx">Event</span><span class="p">.</span><span class="nx">_createDelegate</span><span class="p">(</span><span class="kd">function</span> <span class="p">(</span><span class="nx">event</span><span class="p">,</span> <span class="nx">matchedEl</span><span class="p">,</span> <span class="nx">container</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">return</span> <span class="nx">fnMouseDelegate</span><span class="p">.</span><span class="nx">call</span><span class="p">(</span><span class="nx">matchedEl</span><span class="p">,</span> <span class="nx">event</span><span class="p">,</span> <span class="nx">container</span><span class="p">);</span>
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<span class="p">},</span> <span class="nx">filter</span><span class="p">,</span> <span class="nx">obj</span><span class="p">,</span> <span class="nx">overrideContext</span><span class="p">);</span>
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<span class="p">}</span>
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<span class="k">else</span> <span class="p">{</span>
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<span class="nx">fnDelegate</span> <span class="o">=</span> <span class="nx">Event</span><span class="p">.</span><span class="nx">_createDelegate</span><span class="p">(</span><span class="nx">fn</span><span class="p">,</span> <span class="nx">filter</span><span class="p">,</span> <span class="nx">obj</span><span class="p">,</span> <span class="nx">overrideContext</span><span class="p">);</span>
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<span class="p">}</span>
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<span class="nx">delegates</span><span class="p">.</span><span class="nx">push</span><span class="p">([</span><span class="nx">el</span><span class="p">,</span> <span class="nx">sType</span><span class="p">,</span> <span class="nx">fn</span><span class="p">,</span> <span class="nx">fnWrapper</span><span class="p">]);</span>
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<span class="k">return</span> <span class="k">this</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="nx">sType</span><span class="p">,</span> <span class="nx">fnWrapper</span><span class="p">);</span>
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<span class="p">},</span>
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<span class="cm">/**</span>
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<span class="cm"> * Remove a delegated event listener</span>
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<span class="cm"> * @method removeDelegate</span>
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<span class="cm"> * @param {String} type The name of the event to listen for</span>
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<span class="cm"> * @param {Function} fn The function call when the event fires</span>
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<span class="cm"> * @return {boolean} Returns true if the unbind was successful, false </span>
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<span class="cm"> * otherwise.</span>
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<span class="cm"> * @for Element</span>
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<span class="cm"> */</span>
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<span class="nx">removeDelegate</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">type</span><span class="p">,</span> <span class="nx">fn</span><span class="p">)</span> <span class="p">{</span>
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<span class="kd">var</span> <span class="nx">sType</span> <span class="o">=</span> <span class="nx">Event</span><span class="p">.</span><span class="nx">_getType</span><span class="p">(</span><span class="nx">type</span><span class="p">),</span>
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<span class="nx">index</span> <span class="o">=</span> <span class="nx">Event</span><span class="p">.</span><span class="nx">_getCacheIndex</span><span class="p">(</span><span class="nx">delegates</span><span class="p">,</span> <span class="k">this</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="s2">"element"</span><span class="p">),</span> <span class="nx">sType</span><span class="p">,</span> <span class="nx">fn</span><span class="p">),</span>
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<span class="nx">returnVal</span><span class="p">,</span>
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<span class="nx">cacheItem</span><span class="p">;</span>
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<span class="k">if</span> <span class="p">(</span><span class="nx">index</span> <span class="o">>=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">cacheItem</span> <span class="o">=</span> <span class="nx">delegates</span><span class="p">[</span><span class="nx">index</span><span class="p">];</span>
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<span class="p">}</span>
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<span class="k">if</span> <span class="p">(</span><span class="nx">cacheItem</span><span class="p">)</span> <span class="p">{</span>
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<span class="nx">returnVal</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">removeListener</span><span class="p">(</span><span class="nx">cacheItem</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="nx">cacheItem</span><span class="p">[</span><span class="mi">3</span><span class="p">]);</span>
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<span class="k">if</span> <span class="p">(</span><span class="nx">returnVal</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">delete</span> <span class="nx">delegates</span><span class="p">[</span><span class="nx">index</span><span class="p">][</span><span class="mi">2</span><span class="p">];</span>
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<span class="k">delete</span> <span class="nx">delegates</span><span class="p">[</span><span class="nx">index</span><span class="p">][</span><span class="mi">3</span><span class="p">];</span>
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<span class="nx">delegates</span><span class="p">.</span><span class="nx">splice</span><span class="p">(</span><span class="nx">index</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span>
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<span class="p">}</span>
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<span class="p">}</span>
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<span class="k">return</span> <span class="nx">returnVal</span><span class="p">;</span>
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<span class="p">}</span>
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<span class="p">});</span>
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<span class="p">}());</span>
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</pre></div>
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<li class=""><a href="module_yahoo.html" title="yahoo">yahoo</a></li>
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<li class=""><a href="module_yuiloader.html" title="yuiloader">yuiloader</a></li>
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<li class=""><a href="module_yuitest.html" title="yuitest">yuitest</a></li>
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</ul>
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</div>
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<div id="fileList" class="module">
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<h4>Files</h4>
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<ul class="content">
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<li class="selected"><a href="Element-Delegate.js.html" title="Element-Delegate.js">Element-Delegate.js</a></li>
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</ul>
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</div>
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</div>
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</div>
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</div>
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<div id="ft">
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<hr />
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Copyright © 2010 Yahoo! Inc. All rights reserved.
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</div>
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</div>
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<script type="text/javascript">
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var ALL_YUI_PROPS = [];
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</script>
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</body>
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</html>
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