function newImage(arg) {
if (document.images) {
rslt = new Image();
rslt.src = arg;
return rslt;
}
}

function changeImages() {
if (document.images && (preloadFlag == true)) {
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
}
}
}

var preloadFlag = true;
function preloadImages() {
if (document.images) {
nb_about_over = newImage("/cec/images/nb_about-over.gif");
nb_involvement_over = newImage("/cec/images/nb_involvement-over.gif");
nb_links_over = newImage("/cec/images/nb_links-over.gif");
nb_servicelearning_over = newImage("/cec/images/nb_servicelearning-over.gif");
nb_servicetrips_over = newImage("/cec/images/nb_servicetrips-over.gif");
nb_volunteer_over = newImage("/cec/images/nb_volunteer-over.gif");
preloadFlag = true;
}
}