function menuShow (menuName){
	if (document.layers){
		document.layers[menuName].visibility = 'show';
	}else if (document.all){
		document.all[menuName].style.visibility = 'visible';
	}else if (document.getElementById){
		document.getElementById(menuName).style.visibility = 'visible';
	}
}

function menuHide (menuName){
	if (document.layers){
		document.layers[menuName].visibility = 'hide';
	}else if (document.all){
		document.all[menuName].style.visibility = 'hidden';
	}else if (document.getElementById){
		document.getElementById(menuName).style.visibility = 'hidden';
	}
}