/* pre load nav images */

homeOn = new Image();
    homeOn.src = "graphics/nav/homeover.gif";
newsOn = new Image();
    newsOn.src = "graphics/nav/newsover.gif";
clinicOn = new Image();
    clinicOn.src = "graphics/nav/clinicover.gif";
docsOn = new Image();
    docsOn.src = "graphics/nav/docsover.gif";
introOn = new Image();
    introOn.src = "graphics/nav/introover.gif";
qaOn = new Image();
    qaOn.src = "graphics/nav/qaover.gif";
relatedOn = new Image();
    relatedOn.src = "graphics/nav/relatedover.gif";
contactOn = new Image();
    contactOn.src = "graphics/nav/contactover.gif";