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

function changeImagesArray(array) 
{
	if (preloadTopNav == true) 
	{
		var d = document; var img;
		for (var i=0; i<array.length; i+=2) {
			img = null; var n = array[i];
			if (d.images) {img = d.images[n];}
			if (!img && d.getElementById) {img = d.getElementById(n);}
			if (img) {img.src = array[i+1];}
		}
	}
}

function changeImages() 
{
	changeImagesArray(changeImages.arguments);
}
function preloadImages() 
{
	if (document.images) {
		pre_nav2_over = newImage('/images/nav2-over.gif');
		pre_nav3_over = newImage('/images/nav3-over.gif');
		pre_nav4_over = newImage('/images/nav4-over.gif');
		pre_nav5_over = newImage('/images/nav5-over.gif');
		preloadTopNav = true;
	}
}
preloadImages();