function GallerySmall_onMouseOver(location, name)
{
    var oImage = document.getElementById("ctl00_ContentPlaceHolder1_imgMedium");
    oImage.src = location + name;
}

function BeforeAfterSmall_onMouseOver(ctl, location, name)
{
 var oImage = document.getElementById(ctl);
    oImage.src = location + name;
}