function exMenu(tName)
{
	if (document.all){
	tMenu = document.all[tName].style;		
	if (tMenu.display == 'none') tMenu.display = "block"; else tMenu.display = "none";
	}else{
	if (document.getElementById(tName).style.display == 'none') document.getElementById(tName).style.display = "block"; else document.getElementById(tName).style.display = "none";
	}
}