var imageDir = "images/nav/";
var imageOnStr = "-on";
var imageOffStr = "-off";
var imageExt = ".gif";
var imageNames = new Array('home','about','services','clients','contact');

var onImages = new Array();
var offImages = new Array();
var currentPage = null;

if (document.images) {
	for (var i=0; i<imageNames.length; i++) {
		onImages[imageNames[i]] = new Image(); onImages[imageNames[i]].src = imageDir + imageNames[i] + imageOnStr + imageExt;
		offImages[imageNames[i]] = new Image(); offImages[imageNames[i]].src = imageDir + imageNames[i] + imageOffStr + imageExt;
	}
}

function rollOver(which) {
	if (document.images) {
		document.images[which].src = onImages[which].src;
	}
}

function rollOff(which) {
	if (document.images && currentPage != which) {
		document.images[which].src = offImages[which].src;
	}
}

function setPage(which) { if (which) {
	currentPage = which;
	rollOver(which);
}}