var nava = (document.layers);
var dom = (document.getElementById);
var iex = (document.all);
if (nava) { cach = document.cache }
else if (dom) { cach = document.getElementById("cache").style }
else if (iex) { cach = cache.style }
largeur = screen.width;

cach.visibility = "visible";

function cacheOff()
	{
	cach.visibility = "hidden";
	}