var ie4 = (document.all) ? true : false;
var ie5 = (document.all) ? true : false;
var ie6 = (document.all) ? true : false;
var ns4 = (document.layers) ? true : false;
var ns6 = (document.getElementById && !document.all) ? true : false;

function showlayer(lay)
{
	if (ns4) {
		document.layers[lay].visibility = "show";
	}
        else if (ns6) {
		document.getElementById([lay]).style.display = "block";
	}
        else if (ie4) {
		document.all[lay].style.visibility = "visible";
		document.all[lay].style.display = "inline";
	}
	
}

function hidelayer(lay)
{
        if (ns4) {
		document.layers[lay].visibility = "hide";
	}
        else if (ns6) {
		document.getElementById([lay]).style.display = "none";
	}
	else if (ie4|ie5|ie6) {
		document.all[lay].style.visibility = "hidden";
		document.all[lay].style.display = "none";		
	}
}