function do_popup(url, name, width, height, left, top, extra)
{
  var url = url;
  var name = name;
  var width = width;
  var height = height;
  var left = left;
  var top = top;
  var extra = extra;
  
  
  var optionStr="toolbar=no,location=no,directories=no,status=no,menubar=no";
  
  if(extra=="resize")
  {
     optionStr+=",scrollbars=yes,resizable=yes";
  }
  else
  {
     optionStr+=",scrollbars=no,resizable=no";
  }
  
   
  optionStr+=",width="+width+",height="+height+",top="+top+",left="+left;
  
  
  var targ;
   
  if(name)
  {
    targ=window.open (url, name, optionStr);
  }
  else
  {
    targ=window.open(url, "", optionStr);
  }
  
  targ.focus();
}