/* ---------------------------- */
/* SHOW-HIDE Layer				*/
/* ---------------------------- */
AAAA="none";

function showlayer(layer){
//var myLayer = document.getElementById(layer).style.display;
//if(myLayer=="none"){
//document.getElementById(layer).style.display="block";
//} else {
//document.getElementById(layer).style.display="none";
//}

if(AAAA!="none"){       //is something being displayed?
	document.getElementById(AAAA).style.display="none"; 	//turn off the currently displayed item
	document.getElementById(layer).style.display="block";
} else {					//  no
	document.getElementById("main").style.display="none";
	document.getElementById(layer).style.display="block";
}
AAAA=layer;

}