/* ---------------------------- */
/* SHOW-HIDE Layer				*/
/* ---------------------------- */
function showlayer(layer){
	var myLayer=document.getElementById(layer).style.display;
	if(myLayer=="none"){
	    document.getElementById(layer).style.display = "block";
	    document.getElementById("backScreen").style.display = "block";
	} else {
	    document.getElementById("backScreen").style.display = "none";
		document.getElementById(layer).style.display="none";
		}
}