function obw(i,wd,ht,ttl)
{
  var w = '';
  if(screen){
    var leftPos = screen.availWidth / 2 - (wd/2);
    var topPos = screen.availHeight / 2 - (ht/2);
  }
  var width = wd+2;
  var height = ht+2;
  var theURL = 'big.php?work='+i+'&t='+ttl;
  var winName = 'biggest';
  var features = 'width='+width+',height='+height+',scrollbar=no,statusbar=no,left='+leftPos+',top='+topPos+'';
  w = open(theURL, winName, features);
  return true;
}