function lookup()
{
   if (window.event.altKey == true) {


     rng = document.body.createTextRange();
     rng.moveToPoint(window.event.x, window.event.y);
     rng.expand("word");
     var sLookupWord = rng.text.replace(" ", "");

     var glossaryWindow = window.open("http://www.photographical.net/qf/glossary_ielookup.html#" + sLookupWord, "glossary", "menubar=no, resizable=yes, scrollbars=yes, status=no, width=500");
     glossaryWindow.focus();
     return false;
   } else {
     return true;
   }
}