var imageDirectory = 'i/n/';
var originalImage;

function getOverImgSrc(id) {
	return imageDirectory+id+'_o.png';
}
function preloadImages(name) {
	var img;
	img = new Image();
	img.src= name;
	return img;
}
/*function nav(id) {
	originalImage = id.getElementsByTagName("img")[0].src;
	id.getElementsByTagName("img")[0].src = eval(id.getElementsByTagName("img")[0].id+'_o.src');
}
function navout(id) {
	id.getElementsByTagName("img")[0].src = originalImage;
	originalImage = '';
}
*/
function preload() {
	if(document.images) {
		About_o = preloadImages(getOverImgSrc('About'));
		Clients_o = preloadImages(getOverImgSrc('Clients'));
		Press_o = preloadImages(getOverImgSrc('Press'));
		Contact_o = preloadImages(getOverImgSrc('Contact'));
		Home_o = preloadImages(getOverImgSrc('Home'));
	}
}
window.onload=preload;