function preloadImages() { 

	var img1 = new Image;
	img1.src = 'images/nav/artwork_over.gif';
	
	var img2 = new Image;
	img2.src = 'images/nav/photography_over.gif';
	
	var img3 = new Image;
	img3.src = 'images/nav/webdesign_over.gif';

	var img4 = new Image;
	img4.src = 'images/nav/albumreviews_over.gif';

}

function swapImage(whichImg,newImg) {
	var thisImg = findDOM(whichImg,0);
	thisImg.src = newImg;
}