function findPosY(obj){
			var curtop = 0;
			if(obj.offsetParent){
				while(obj.offsetParent){
					curtop += obj.offsetTop
					obj = obj.offsetParent;
				}
			}
			else if(obj.y){

				curtop += obj.y;
			}
			return curtop;
		}

function expandBox(displayname){
			var navlayer, gateimage;

			
			for(var i in navlayers){
				if(navlayers[i] != null){
				
				navlayer = document.getElementById(navlayers[i]);
				gateimage = document.getElementById(navimages[i]);

					 

					if(i == displayname && i != activename){
						
						navlayer.className = 'div_on';
						navlayer.style.top = findPosY(gateimage) + 0 + 'px';
						navlayer.style.left =  8 + 'px';
						activename = i;
					}
					else{
					
						navlayer.className = 'div_off';
						if(i == displayname){
							
							activename = null;
						}
					}
				}
				
			}	
		}