ns4 = (document.layers)? true:false
	ie4 = (document.all) && !(document.getElementById)? true:false
	ie5 = (document.getElementById) && (document.all)? true:false
	ns6 = (document.getElementById) && !(document.all)? true:false
	function zmienClip(id,t,r,b,l) {
		if (ns4) {
			document.layers[id].clip.top = t
			document.layers[id].clip.right = r
			document.layers[id].clip.bottom = b
			document.layers[id].clip.left = l
		}
		else if (ie4) id.style.clip = "rect("+t+"px "+r+"px "+b+"px "+l+"px)";
		else if (ie5||ns6) document.getElementById(id).style.clip = "rect("+t+"px "+r+"px "+b+"px "+l+"px)";
}

function ukryj(){
zmienClip('menu',0,950,125,0);
}
function odkryj(){
zmienClip('menu',0,950,359,0);
}