var rollOverArr=new Array();
function setrollover(OverImgSrc,pageImageName)
{
if (! document.images)return;
if (pageImageName == null)
    pageImageName = document.images[document.images.length-1].name;
rollOverArr[pageImageName]=new Object;
rollOverArr[pageImageName].overImg = new Image;
rollOverArr[pageImageName].overImg.src=OverImgSrc;
}

function rollover(pageImageName)
{
if (! document.images)return;
if (! rollOverArr[pageImageName])return;
if (! rollOverArr[pageImageName].outImg)
    {
    rollOverArr[pageImageName].outImg = new Image;
    rollOverArr[pageImageName].outImg.src = document.images[pageImageName].src;
    }
document.images[pageImageName].src=rollOverArr[pageImageName].overImg.src;
}

function rollout(pageImageName)
{
if (! document.images)return;
if (! rollOverArr[pageImageName])return;
document.images[pageImageName].src=rollOverArr[pageImageName].outImg.src;
}


<!--
setrollover('images/nav/homeover.gif', 'home');
setrollover('images/nav/bihrtover.gif', 'bihrt');
setrollover('images/nav/painover.gif', 'pain');
setrollover('images/nav/sportsover.gif', 'sports');
setrollover('images/nav/vetover.gif', 'vet');
setrollover('images/nav/otherover.gif', 'other');
setrollover('images/nav/newsover.gif', 'news');
setrollover('images/nav/teamover.gif', 'team');
setrollover('images/nav/faqover.gif', 'faq');
setrollover('images/nav/askover.gif', 'ask');
//-->