function showDiv(m){
	var obj = document.getElementById(m).style;
	if(obj.visibility == "hidden"){
		obj.visibility = "visible";
	}else{
		obj.visibility = "hidden";
	}
}
function myIni(){
	document.getElementById("layer2_1").style.visibility = "hidden";
	document.getElementById("layer3_1").style.visibility = "hidden";
}