function init(){

	var obj,obj1,obj2,obj3;

	obj = document.getElementById("category1");
	obj1 = document.getElementById("category2");
	obj2 = document.getElementById("category3");
	obj3 = document.getElementById("category4");

	if(obj.addEventListener){
		obj.addEventListener("mouseover",switchit,false);
		obj1.addEventListener("mouseover",switchit,false);
		obj2.addEventListener("mouseover",switchit,false);
		obj3.addEventListener("mouseover",switchit,true);
	}

	else {
		obj.onmouseover = switchit;
		obj1.onmouseover = switchit;
		obj2.onmouseover = switchit;
		obj3.onmouseover = switchit;
	}


}



function finding(parentLI){

	for (var i=0;i<parentLI.childNodes.length ;i++ )
	{
		if (parentLI.childNodes[i].className =='subcategory' && parentLI.childNodes[i].nodeName =='UL')
		{
			return parentLI.childNodes[i];
		}
	}

	return NULL;
}

function switchit(evt){

	var myNode;

	if (typeof(evt) =='object')
	{
		myNode = evt.target;
		parentLI =myNode.parentNode;
	}

	else{ 
		myNode=window.event.srcElement;
		parentLI = myNode.parentElement;
	}

	var obj =finding(parentLI);

	var flag = (obj.style.display=="block")?(obj.style.display ="none"):(obj.style.display="block");
		
}