function unHoverAll() {
    $('li_hardy').className="";
    $('li_atkinson').className="";
    $('li_clay').className="";
    $('li_laouiti').className="";
    $('li_benedetti').className="";
    $('li_pallieres').className="";

    $('bio_hardy').style.display="none";
    $('bio_atkinson').style.display="none";
    $('bio_clay').style.display="none";
    $('bio_laouiti').style.display="none";
    $('bio_benedetti').style.display="none";
    $('bio_pallieres').style.display="none";
}

Event.observe(
    window,
    'load',
    function() {
        Event.observe('li_hardy', 'mouseover', function() { unHoverAll(); $('li_hardy').className="hovered"; $('bio_hardy').style.display="block"; });
        Event.observe('li_atkinson', 'mouseover', function() { unHoverAll(); $('li_atkinson').className="hovered"; $('bio_atkinson').style.display="block"; });
        Event.observe('li_clay', 'mouseover', function() { unHoverAll(); $('li_clay').className="hovered"; $('bio_clay').style.display="block"; });
        Event.observe('li_laouiti', 'mouseover', function() { unHoverAll(); $('li_laouiti').className="hovered"; $('bio_laouiti').style.display="block"; });
        Event.observe('li_benedetti', 'mouseover', function() { unHoverAll(); $('li_benedetti').className="hovered"; $('bio_benedetti').style.display="block"; });
        Event.observe('li_pallieres', 'mouseover', function() { unHoverAll(); $('li_pallieres').className="hovered"; $('bio_pallieres').style.display="block"; });

        unHoverAll();
        $('li_hardy').className="hovered";
        $('bio_hardy').style.display="block"; 
    }

);