function open_win(name,w,h) {
   window.open(name,'calculator','width=' + w + ',height=' + h + ',resizable=1,toolbar=0,scrollbars=1');
}

var newWin = null;  
  function popup(strURL, strType, strWidth, strHeight) {  
  if (newWin != null && !newWin.closed)  
    newWin.close();  
  var strOptions="";  
  if (strType=="console")  
    strOptions="resizable,scrollbars,height="+  
      strHeight+",width="+strWidth;  
  if (strType=="fixed")  
    strOptions="status,scrollbars,height="+  
      strHeight+",width="+strWidth;  
  if (strType=="elastic")  
    strOptions="toolbar,menubar,scrollbars,"+  
      "resizable,location,height="+  
      strHeight+",width="+strWidth;  
  newWin = window.open(strURL, 'newWin', strOptions);  
  newWin.focus();  
}