function swapImage(target, newimage) {
    if (document.images)
       if (document.getElementById(target))
          document.getElementById(target).src=newimage;
};

function swapImageAndLink(target, newimage, newlink) {
    if (document.images) {
       if (document.getElementById(target))
          document.getElementById(target).src=newimage;
       targetlink = target + "link";
       if (document.getElementById(targetlink))
          document.getElementById(targetlink).href=newlink;
       }
};