document.write('<STYLE TYPE="text/css">.imgTrans{ filter:revealTrans(duration=0.4,transition=12) }</STYLE>');

var onImages=new Array();
function Rollover(imgName, imgSrc)
{
        onImages[imgName] = new Image();
        onImages[imgName].src = imgSrc;
}

function turnOn(imgName){
        if(document.images[imgName].filters != null)
                document.images[imgName].filters[0].apply();
        document.images[imgName].offSrc = document.images[imgName].src;
        document.images[imgName].src    = onImages[imgName].src;
        if(document.images[imgName].filters != null)
                document.images[imgName].filters[0].play();
}

function turnOff(imgName){
        if(document.images[imgName].filters != null)
                document.images[imgName].filters[0].stop();
        document.images[imgName].src = document.images[imgName].offSrc;
}

Rollover("home", "http://www.3par.com/images/flags/nav_arrow_on.jpg");