function show_hide_tree(objDiv, imgObj)
	{
		var obj=document.getElementById(objDiv);
		if(obj.style.display=="" || obj.style.display=="block"){
			obj.style.display="none";
		}else{
			obj.style.display="block";		
		}
		
	
		if(imgObj.src.indexOf("plus")>0){
			imgObj.src="images/minus_bullet.gif";
		}
		else{
			imgObj.src="images/plus_bullet.gif";
		}
	}