//designbynur



var image1 = new Image();
image1.src = "nav/nav_b1.gif";
var image2 = new Image();
image2.src = "nav_b2.gif";
var image3 = new Image();
image3.src = "nav_b3.gif";
var image4 = new Image();
image4.src = "nav_b4.gif";

function roll(img_name, img_src)
	{
	document[img_name].src = img_src;
	}