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 resetStudent(header){
	for (i=1; i<=6; i++) {
		if(IE)document.all["header" + i + "Div"].style.visibility=hide
		if(NS)document["header" + i + "Div"].visibility=hide
		document.images["f_rollover_" + i].src = "/images/rollovers/02f/f_rollover_" + i + ".gif";
	}
	if(IE)document.all[header].style.visibility=show
    if(NS)document.layers[header].visibility=show
}

function resetTeachers(tool){
	for (i=1; i<=11; i++) {
		if(IE)document.all["header" + i + "Div"].style.visibility=hide
		if(NS)document["header" + i + "Div"].visibility=hide
		document.images["t_rollover_" + i].src = "/images/rollovers/t_rollover_" + i+ ".gif"
	}
	if(IE)document.all[tool].style.visibility=show
    if(NS)document.layers[tool].visibility=show
}

function resetProducts(product){
	for (i=1; i<=7; i++) {
		if(IE)document.all["header" + i + "Div"].style.visibility=hide
		if(NS)document["header" + i + "Div"].visibility=hide
		document.images["hs_rollover_" + i].src = "/images/rollovers/hs_rollover_" + i+ ".gif"
	}
	if(IE)document.all[product].style.visibility=show
    if(NS)document.layers[product].visibility=show
}