var ns4=document.layers
var ie4=document.all
var ns6=document.getElementById&&!document.all

function hidebox()
{
	crossobj=ns6? document.getElementById("showimage") : document.all.showimage
	
	if (ie4||ns6)
		crossobj.style.visibility="hidden"
	else if (ns4)
		document.showimage.visibility="hide"
}