if (document.images) {
img1 = new Image ();
img1.src = "blank.gif";
img2 = new Image ();
img2.src = "blank.gif";
img3 = new Image ();
img3.src = "blank.gif";


img1r = new Image ();
img1r.src = "arrowd.gif";
img2r = new Image ();
img2r.src = "arrowd.gif";
img3r = new Image ();
img3r.src = "arrowd.gif";

}

function aOn (imgName) {
	if (document.images) {
		document [imgName].src = eval (imgName + "r.src");
		
		}
}
function aOff (imgName) {
	if (document.images) {
		document [imgName].src = "blank.gif";
		document [imgName].src = eval (imgName + ".src");
	}
}