// Universal image rollover functions
function imghighlight(whichimg) {
var imgsrc = new String(whichimg.src);
imgsrc = imgsrc.replace(new RegExp('_off\.','g'),'_on\.');
whichimg.src = imgsrc;
}

function imgnohighlight(whichimg) {
var imgsrc = new String(whichimg.src);
imgsrc = imgsrc.replace(new RegExp('_on\.','g'),'_off\.');
whichimg.src = imgsrc;
}