function SelectTopNav() {
        var pageUrl = location.href;
        
        var aPages = ['home', 'join_us', 'about_us', 'contact_us', 'benefits'];
        
        for (i = 0; i < aPages.length; i++) {
            if ( pageUrl.indexOf(aPages[i] + '.jsp') != -1 ) {
                Rollover(aPages[i], 'on');
            }
            else {
                Rollover(aPages[i], 'off');
            }
        }
    }
    
    function Rollover(imgName, action) {
        var img = document.images.namedItem(imgName);
        var pageUrl = location.href;

        if ( action == "on" || (pageUrl.indexOf(imgName + '.jsp') != -1) ) {
            img.src = '/images/sptcareers/on/' + imgName + '_on.gif'; 
        }
        else {
            img.src = '/images/sptcareers/off/' + imgName + '_off.gif';
        }
    }
    
    
window.onbeforeunload = function () {
   SelectTopNav();
}