DOM = (document.getElementById) ? 1 : 0;
NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all) ? 1 : 0;

//var loaded = 0;			// to avoid stupid errors of Microsoft browsers

function raise(menuName,on) {
//	if (loaded) {	// to avoid stupid errors of Microsoft browsers
		if (on) {
			if (DOM) { document.getElementById(menuName).style.visibility = "visible"; }
			else if (NS4) { document.layers[menuName].visibility = "show"; }
			else { document.all[menuName].style.visibility = "visible"; }
		}
		else {
			if (DOM) { document.getElementById(menuName).style.visibility = "hidden"; }
			else if (NS4) { document.layers[menuName].visibility = "hide"; }
			else { document.all[menuName].style.visibility = "hidden"; }
		}
//	}
}