var oldObj = null;


	function isNull(obj){
		if(document.getElementById(obj)!=null)
			return false;
		else 
			return true;
	}
	
	
	function show(id){
		obj = id+'sub';
		if(!isNull(obj)){
			document.getElementById(obj).style.display = 'block';
		}	
		if(oldObj == obj){
			oldObj = null;
		}else{
			oldObj = obj;
		}	
	}

	function hide(element){			
		if(isNull(element) && !isNull(oldObj)){
			if(oldObj.indexOf("sub")>-1)
				document.getElementById(oldObj).style.display = 'none';				
			oldObj = null;	
		}else if(!isNull(element)){
				document.getElementById(element).style.display = 'none';				
				oldObj = null;	
		}			
	}		

	function showhide(){			
		hide();
		show(this.id);
	}

	function initMenu(){			
			document.getElementById('bigimage').onmouseover = hide;
			//document.getElementById('content').onmouseover = hide;			
			var menu = document.getElementById("menu");
			li = menu.nextSibling;		
			for (i=1;i<=menu.childNodes.length;i++){
				li = document.getElementById('m'+i);
				if(isNull(li.id+'sub')){
					li.onmouseover = hide;
				}else{
					document.getElementById(li.id+'sub').style.display = 'none';
					li.onmouseover = showhide;
				}
			}
		}


		window.onload=function(){
									initMenu();
								}