var timerID="";
/* レイヤー表示 */
function pullopen(n){
	if(timerID!=""){
		clearTimeout(timerID);
	}
	var val = n;
	dellayer();
	document.getElementById(val).style.visibility="visible";
	document.getElementById(val).style.zIndex="1";
}
/* レイヤー消去 */
function pulldel(){
	timerID=setTimeout("dellayer()",10);
}
function dellayer(){
	for (i=1;i<4;i++){
		var val2 = "pull" + i;
		document.getElementById(val2).style.visibility="hidden";
		document.getElementById(val2).style.zIndex="0";
	}
}