$(document).ready(function() {

    //rollover effect on links 
    $("a.simplehover img, img.simplehover").mouseover(function() {
        $(this).attr("src", $(this).attr("src").replace("-off.", "-on."));
    }).mouseout(function() {
        $(this).attr("src", $(this).attr("src").replace("-on.", "-off."));
    });
    
            
});