window.onload=montre;
function montre(id, over) {
var d = document.getElementById(id);
var bt = document.getElementById(over);
	for (var i = 1; i<=4; i++) {
		if (document.getElementById('smenu'+i)) {document.getElementById('smenu'+i).style.display='none';}
		var btId = "bt"+i;
		var btClassNameOff = "bt"+i+"_off";
		document.getElementById(btId).className=btClassNameOff;
	}
if (d) {d.style.display='block';}
if(bt) {document.getElementById(over).className="bt_active";}
}