var url="";
var imgObjSupport = false;
if (document.images) {imgObjSupport = true;} else {imgObjSupport = false;} 
if (imgObjSupport) { 

pr_off = new Image(143, 26);
pr_off.src = "/pix/n_pr.gif";
pr_on = new Image(143, 26);
pr_on.src = "/pix/na_pr.gif";

services_off = new Image(95, 26);
services_off.src = "/pix/n_services.gif";
services_on = new Image(95, 26);
services_on.src = "/pix/na_services.gif";

about_off = new Image(129, 26);
about_off.src = "/pix/n_about.gif";
about_on = new Image(129, 26);
about_on.src = "/pix/na_about.gif";

clients_off = new Image(114, 26);
clients_off.src = "/pix/n_clients.gif";
clients_on = new Image(114, 26);
clients_on.src = "/pix/na_clients.gif";

contacts_off = new Image(215, 26);
contacts_off.src = "/pix/n_contacts.gif";
contacts_on = new Image(215, 26);
contacts_on.src = "/pix/na_contacts.gif";

}

function roll_on(imgName) {if (imgObjSupport) {imgOn = eval(imgName + "_on.src"); document [imgName].src = imgOn;}}
function roll_off(imgName) {if (imgObjSupport) {imgOff = eval(imgName + "_off.src"); document [imgName].src = imgOff;}}