netscape = (navigator.appName == "Netscape");
n3 = netscape && (parseInt(navigator.appVersion) >= 3);
explorer = (navigator.appName == "Microsoft Internet Explorer");
ie4 = explorer && (parseInt(navigator.appVersion) >= 4);


function touch(img_name,img_src) {
if (n3 || ie4) {
document[img_name].src=img_src;

	}
}

function untouch(img_name,img_src) {
if (n3 || ie4) {
document[img_name].src=img_src;

	}
}