function fixedIE(tl, n, el){
  var sc = 'scroll'+tl, d = document, c = 'compatMode',
  b = d[c]&&d[c]=='CSS1Compat'? d.documentElement : d.body;
  n = n-0; if(typeof n!='number')return 0;
  if(/^(Top|Left)$/.test(tl))
  return b[sc]+n+'px';
  
  if(/^(Bottom|Right)$/.test(tl)&&typeof el=='object'){
    tl = tl=='Right'? 'Left' : 'Top', sc = 'scroll'+tl;
    var dim = 'client' + (tl=='Top'? 'Height' : 'Width');
    return b[sc]+b[dim]-el[dim]-n+'px';
  }
  return 0;
}