function unHoverAll() {
    $('li_corporate').className="";
    $('li_virtualization').className="";
    $('li_mobility').className="";
    $('li_self_service').className="";
    $('li_syncseer').className="";

    $('collage_corporate').style.display="none";
    $('collage_virtualization').style.display="none";
    $('collage_mobility').style.display="none";
    $('collage_self_service').style.display="none";
    $('collage_syncseer').style.display="none";
}

Event.observe(
    window,
    'load',
    function() {
        Event.observe('li_corporate', 'mouseover', function() { unHoverAll(); $('li_corporate').className="hovered"; $('collage_corporate').style.display="block"; });
        Event.observe('li_virtualization', 'mouseover', function() { unHoverAll(); $('li_virtualization').className="hovered"; $('collage_virtualization').style.display="block"; });
        Event.observe('li_mobility', 'mouseover', function() { unHoverAll(); $('li_mobility').className="hovered"; $('collage_mobility').style.display="block"; });
        Event.observe('li_self_service', 'mouseover', function() { unHoverAll(); $('li_self_service').className="hovered"; $('collage_self_service').style.display="block"; });
        Event.observe('li_syncseer', 'mouseover', function() { unHoverAll(); $('li_syncseer').className="hovered"; $('collage_syncseer').style.display="block"; });

        unHoverAll();

        $('li_corporate').className="hovered";
        $('collage_corporate').style.display="block";

        $('virtualization_customers_image').src = "Logos_Cust_Virtualization_05.jpg";
        $('mobility_customers_image').src = "Logos_Cust_Mobility_03.jpg";
        $('self_service_customers_image').src = "Logos_Cust_Self-Service_04.jpg";
        $('iep_customers_image').src = "Logos_Cust_IntelEventPro_02.jpg";

    }

);