function Browser() {
	this.ns6 = (!document.all && document.getElementById) ? true : false;
	this.ns4 = (document.layers) ? true : false;
	this.ie4 = (document.all) ? true : false;
}
var browser = new Browser();

function getLayerRef(theString) {
	if (browser.ns4) var ref = "document." + theString;
	if (browser.ie4) var ref = "document.all." + theString + ".style";
	if (browser.ns6) var ref = "document.getElementById('" + theString + "').style";
	return eval(ref);
}

function showLayer(theLayer) {
	if (browser.ns4) getLayerRef(theLayer).visibility = "show";
	if (browser.ie4 || browser.ns6) getLayerRef(theLayer).visibility = "visible";
}

function hideLayer(theLayer) {
	if (browser.ns4) getLayerRef(theLayer).visibility = "hide";
	if (browser.ie4 || browser.ns6) getLayerRef(theLayer).visibility = "hidden";
}