function setMouseOverImage(imgs) {
    for (var i in imgs)
    {
        var img = document.getElementById(imgs[i]);
        img.src =  img.src.replace(/.jpg/,"_1.jpg");
    }
}

function setMouseOutImage(imgs) {
    for (var i in imgs)
    {
        var img = document.getElementById(imgs[i]);
        img.src = img.src.replace(/_1.jpg/,".jpg");
    }
}