#bottompopup {
  /* Netscape 4, IE 4.x-5.0/Win and other lesser browsers will use this */
  position: absolute; left: 0px; bottom: 0px;vertical-align:top;
}
body > div#bottompopup {
  /* used by Opera 5+, Netscape6+/Mozilla, Konqueror, Safari, OmniWeb 4.5+, iCab, ICEbrowser */
  position: fixed;
}