var cur_layer = 0;
var timer;
var mfix=0;


function Show(layer_num) {
var i;
document.getElementById('menu'+layer_num).style.display="block";
for (i=1;i<6;i++){if (i!=layer_num) {document.getElementById('menu'+i).style.display="none";}}
cur_layer=layer_num;
Fixmenu();
}

function Fixmenu(){
	mfix=1;
}

function Unfixmenu(){
	mfix=0;
	Hide();
}

function Dis() {
if (mfix==0){
document.getElementById('menu'+cur_layer).style.display="none";	}
}

function Hide() {
timer = setTimeout("Dis()", 500);
}