function Rollover(objImg)
{
	//alert(objImg.src) 
  var strImageSrc = objImg.src
  var strNewImage = ""
  if (strImageSrc.indexOf("_off") != -1)
  {
    strNewImage = strImageSrc.replace(/_off/ , "_on")
  }
  else
  {
    strNewImage = strImageSrc.replace(/_on/ , "_off")
  }
  objImg.src =  strNewImage
}