function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		kids_over = newImage("images/newhome/nav/kids-over.gif");
		educators_over = newImage("images/newhome/nav/educators-over.gif");
		marsfacts_over = newImage("images/newhome/nav/marsfacts-over.gif");
		themission_over = newImage("images/newhome/nav/themission-over.gif");
		gallery_over = newImage("images/newhome/nav/gallery-over.gif");
		news_over = newImage("images/newhome/nav/news-over.gif");
		preloadFlag = true;
	}
}

var ns4 = false;
if ((navigator.appName == 'Netscape') && (parseInt(navigator.appVersion) == 4)) {
	ns4 = true;
}

var monthNames = new Array("January","February","March","April","May","June","July","August","September","October","November","December");

var now = new Date();

function popWindow(url, name, w, h) {
	var winParameters = "width=" + w + ",height=" + h + ",scrollbars=yes";
	win = window.open(url, name, winParameters);
	win.focus();
}

function popImage(f) {
	popWindow('rovers/popup.shtml?thumb='+f, 'pop', 550, 440);
}

function buildOpt(t) {
	if (!ns4) {
		document.write("<select onchange='eval(this.options[this.selectedIndex].value)'>");
		document.write("<option>"+ t +"</option>");
		var i = 1;
		while (i < arguments.length) {
			if (arguments[i]) {
				document.write("<option value=\"w=window.open('" + arguments[i+2] + "','win');w.focus();\">" + arguments[i+1] + "</option>");
			} else {
				document.write("<option value=\"document.location='" + arguments[i+2] + "'\">" + arguments[i+1] + "</option>");
			}
			i += 3;
		}
		document.write("</select>");
	} else {
		document.write("<h3>" + t + "</h3>");
		document.write("<ul>");
		var i = 1;
		while (i < arguments.length) {
			o = "<li><a href='" + arguments[i+2] + "'";
			o += arguments[i] ? " target='_blank'" : "";
			o += ">" + arguments[i+1] + "</a></li>";
			document.write(o);
			i += 3;
		}
		document.write("</ul>");
	}
}