function switchImage(imgName, imgSrc) {
	if (document.images) {
		if (imgSrc != "none") {
			document.images[imgName].src = imgSrc;
		}
	}
}

function preloadImages() {
	var args = preloadImages.arguments;
	document.imageArray = new Array(args.length);

	for (var i=0; i<args.length; i++) {
		document.imageArray[i] = new Image;
		document.imageArray[i].src = args[i];
	}
}

function preload() {
	preloadImages('images/home_up.jpg','images/about_up.jpg','images/struct_up.jpg',
		'images/contact_up.jpg','images/links_up.jpg','images/home_over.jpg',
		'images/about_over.jpg','images/struct_over.jpg','images/contact_over.jpg',
		'images/links_over.jpg','images/arrow_red.gif','images/arrow_green.gif');
}

function confirmAction() {
	return confirm("This is a link to an external website.  If you choose to continue you will be directed away from this website but can return later by using the 'Back' button.  Is this what you want to do?");
}