function preload_image(image_name)
{
	var img = new Image;
	img.src = 'images/' + image_name + '.png';
	return img;
}

function preload_all_images()
{
	var names = new Array('about', 'code', 'stuff', 'links');
	var imgs = new Array();

	for (var i = 0; i < names.length; i++) {
		imgs.push(preload_image(names[i]));
		imgs.push(preload_image(names[i] + '-st'));
	}
}

function image_enter(img_id)
{
	var img = document.getElementById(img_id);

	if (img != null)
		img.src = 'images/' + img_id + '-st.png';
}

function image_leave(img_id)
{
	var img = document.getElementById(img_id);

	if (img != null)
		img.src = 'images/' + img_id + '.png';
}

preload_all_images();