function hideit(whichLayer,onoff) {
	if(onoff != undefined) {
		if (document.getElementById) {
			var style2 = document.getElementById(whichLayer).style;
			style2.visibility = onoff ? "hidden":"visible";
		} else if (document.all) {
			var style2 = document.all[whichLayer].style;
			style2.visibility = onoff ? "hidden":"visible";
		} else if (document.layers) {
			var style2 = document.layers[whichLayer].style;
			style2.visibility = onoff ? "hidden":"visible";
		}
	} else {
		if (document.getElementById) {
			var style2 = document.getElementById(whichLayer).style;
			style2.visibility = style2.visibility? "":"visible";
		} else if (document.all) {
			var style2 = document.all[whichLayer].style;
			style2.visibility = style2.visibility? "":"visible";
		} else if (document.layers) {
			var style2 = document.layers[whichLayer].style;
			style2.visibility = style2.visibility? "":"visible";
		}
	}
}


function hideall(showwhat) {
	hideit('menu_fahrzeuge',1);
	hideit('menu_technik',1);
	if(showwhat) hideit(showwhat,0);
}