var currentLayerarea ="area1";
var currentDivarea = "z1"; 
function showLayerarea(obj,div){
	if(currentLayerarea!=obj.id) { 
	showItarea(currentLayerarea,currentDivarea,false); 
	currentLayerarea = obj.id; 
	currentDivarea = div;
	showItarea(currentLayerarea,currentDivarea,true); 
	}
}
function showItarea(o,d,mode){
	var obj = document.getElementById(o);
	var div = document.getElementById(d); 
	obj.className = mode?"active1":"inactive1";
	div.style.display = mode?"block":"none";
}