var ns4 = (document.layers); 
	  var ie4 = (document.all && !document.getElementById);
  	var ie5 = (document.all && document.getElementById);
	  var ns6 = (!document.all && document.getElementById);

	  function attach(id) 
		{
			var obj
			if(ns4) obj = document.layers[id];
			else if(ie4) obj = document.all[id];
			else if(ie5 || ns6) obj = document.getElementById(id);
			return obj
		} 
		
  	function banner(id_parent, id_child,flag) 
		{
			parentlayer = attach(id_parent);
			childlayer = attach(id_child);

			if(flag == 1)
			{
				parentlayer.style.visibility = "hidden";
				childlayer.style.visibility  = "visible";
			} 
			else
			{
				parentlayer.style.visibility = "visible";
				childlayer.style.visibility  = "hidden";
			}
			
		}