function get_all_children(root){
   if(!root)root=document;
   var queue=new Array();
   queue.push(root);
   var ret=new Array();
   while(queue.length>0){
       element=queue.pop();
       if(element.tagName=='LI') ret.push(element);
       if(element.childNodes!=null){
           if(element.childNodes.length>0){
               for(i=0;i<element.childNodes.length;i++){
                   queue.push(element.childNodes[i]);
               }
           }
       }
   }
   return ret;
}

window.onload = function(){	
	var children = get_all_children();
	
	for (var i = 0; i < children.length; i++) {
		children[i].onmouseover = function() {
			this.className += ' active';
		}
		children[i].onmouseout = function() {
			this.className = this.className.replace(' active', '');
		}
	}
}