ction Checkbox( id ) {
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&#160;&#160;this.id = id;
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} // end Checkbox
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/**

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 * init is a subclass of Checkbox and is used to initialize the event handlers 
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 *
<br>
 * @member Checkbox
<br>
 *
<br>
 * @return none
<br>
 */

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<br>
Checkbox.prototype.init = function() {
<br>

<br>
&#160;&#160;this.node = document.getElementById(this.id);
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&#160;&#160;this.image_node = this.node.getElementsByTagName("img")[0];
<br>

<br>
&#160;&#160;if( this.node.getAttribute("aria-chec