var myBrowser=navigator.appName
var myVersion=navigator.appVersion
var version45=(myVersion.indexOf("4.")!=-1
||myVersion.indexOf("5.")!=-1)
var NS=(myBrowser.indexOf("Netscape")!=-1 && version45)
var IE=(myBrowser.indexOf("Explorer")!=-1 && version45)
if(IE){var hide="hidden"; var show="visible"}
if(NS){var hide="hide"; var show="show"}

var myimages=new Array()
function preloadimages(){
	for (i=0;i<preloadimages.arguments.length;i++){
		myimages[i]=new Image()
		myimages[i].src=preloadimages.arguments[i]
	}
}

function swapImage() {
	if (document.images) {
		for(var i=0;i<arguments.length;i++) {
			document.images[arguments[i]].src = arguments[i+1];
			++i;
		}
	}
}

function setDiv(navText){
	if(IE)document.all[navText].style.visibility=show
    if(NS)document.layers[navText].visibility=show
}

function resetDiv(navText){
	for (t=1; t<=6; t++) {
		if(IE)document.all["topnav" + t + "Div"].style.visibility=hide
		if(NS)document["topnav" + t + "Div"].visibility=hide
		document.images["topnav_" + t].src = "/images/nav/topnav_" + t+ ".gif";
	}
}