if (document.getElementsByTagName)
  {
    var docLinkArray = document.getElementsByTagName("A");
    var thisLink
    for (i = 0; i < docLinkArray.length; i++)
      {
        thisLink = docLinkArray[i]
        if (thisLink.className == 'popup')
          {
            thisLink.href = thisLink.href.replace(/sp.cfm/,'popup.cfm')
            thisLink.onclick = function(){popWindow(this.href,500,500);return false}
          }
      }
  }//end, object check