image1 = new Image( );
image1.src = "/img/nav/home2.png";
image2 = new Image( );
image2.src = "/img/nav/about2.png";
image3 = new Image( );
image3.src = "/img/nav/portfolio2.png";
image4 = new Image( );
image4.src = "/img/nav/quote2.png";

function roll( image_id, new_image )
{
	document.getElementById( image_id ).src = "/img/nav/" + new_image;
}