var nn4 = (document.layers) ? true : false;
var ie = (document.all) ? true : false;
var dom = (document.getElementById && !document.all) ? true : false;

function browser(id){
	if(nn4) {
		path = document.layers[id];
	}
	else if(ie) {
		path = document.all[id];
	}
	else {
		path = document.getElementById(id);
	}
return path  //return the path to the css layer depending on which browser is looking at the page
}

function showLayer(id) {
var lyr = browser(id);
	if(nn4){
		lyr.visibility = "visible";
	}
	else{
		lyr.style.visibility = "visible";
	}
}

function hideLayer(id) {
var lyr = browser(id);
	if(nn4){
		lyr.visibility = "hidden";
	}
	else{
		lyr.style.visibility = "hidden";
	}
}