function showlayer(div){
	var myDiv = document.getElementById(div).style.visibility;
	if(myDiv=="hidden"){
		document.getElementById(div).style.visibility="visible";
	}else{ 
		document.getElementById(div).style.visibility="hidden";
	}
	/*var myDiv = document.getElementById(div).style.display;
	if(myDiv=="none"){
		document.getElementById(div).style.display="block";
	}else{ 
		document.getElementById(div).style.display="none";
	}*/
}