function showSubMenu(layer, pix){
	hideActive();
	document.getElementById(submenu(layer)).style.visibility="visible";
	hover(layer, pix);
}
function hideSubMenu(layer, pix){
	document.getElementById(submenu(layer)).style.visibility="hidden";
	showActive();
	out(layer);
	hover(active, active_width);
}
function showActive(){
	document.getElementById(submenu(active)).style.visibility="visible";
}
function hideActive(){
	document.getElementById(submenu(active)).style.visibility="hidden";
}
function submenu(name) {
	return "submenu_"+name;
}
function menu(name) {
	return "menu_"+name;
}
function hover(name, pix){
	document.getElementById(menu(name)).style.backgroundPosition= pix + "px 0";
}
function out(name){
	showActive();
	document.getElementById(menu(name)).style.backgroundPosition="0 0";
	//showActive();
}