function Rollovers(objImg)
{

  var strImageSrc = objImg.src;
  var strNewImage = "";
  if (strImageSrc.indexOf("_off") != -1)
  {
    strNewImage = strImageSrc.replace(/_off/ , "_over");
  }
  else
  {
    strNewImage = strImageSrc.replace(/_over/ , "_off");
  }
  objImg.src =  strNewImage;
}