var layeron = "";
var layerhold = "";
function hold(number){
	if(layerhold.length > 0){
	    document.getElementById(layerhold).style.visibility = "hidden";
		//document.getElementById("layerbg").style.visibility = "hidden";
	}
	document.getElementById(number).style.visibility = "visible";
	//document.getElementById("layerbg").style.visibility = "visible";
	layerhold = number;
	}
function on(number){
	document.getElementById("main" + number).className = "on";
	}
function off(number){
	document.getElementById("main" + number).className = "";
	}
function subon(number){
	document.getElementById("main" + number).className = "subon";
	}
function suboff(number){
	document.getElementById("main" + number).className = "sub";
	}
function subsubon(number){
	document.getElementById("main" + number).className = "subsubon";
	}
function subsuboff(number){
	document.getElementById("main" + number).className = "subsub";
	}
function nofunction(){

}
function clearlayer(){
    if(layerhold.length > 0){
		document.getElementById("link" + layerhold.replace("layer","")).className = "";
		document.getElementById(layerhold).style.visibility = "hidden";
		//document.getElementById("layerbg").style.visibility = "hidden";
	}
}