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 = false;
function preloadImages() {
if (document.images) {
DOHlogocorner_over = newImage("images/DOHlogocorner-over.gif");
DOHlogocornershort_over = newImage("images/DOHlogocornershort-over.gif");
bcontact_over = newImage("images/bcontact-over.gif");
bhome_over = newImage("images/bhome-over.gif");
btop_over = newImage("images/btop-over.gif");
butcharts_over = newImage("images/butcharts-over.gif");
butcontents_over = newImage("images/butcontents-over.gif");
butsurvey_over = newImage("images/butsurvey-over.gif");
preloadFlag = true;
}
}