function WinOpen(url,windowname,wx,wy) {
  var features="location=no, menubar=no, status=yes, scrollbars=yes, resizable=yes, toolbar=no";
  if (wx) {
    if (window.screen.width > wx)
      features+=", left="+(window.screen.width-wx)/2;
    else
      wx=window.screen.width;
    features+=", width="+wx;
  }
  if (wy) {
    if (window.screen.height > wy)
      features+=", top="+(window.screen.height-wy)/2;
    else
      wy=window.screen.height;
    features+=", height="+wy;
  }
  // document.write(features + "<br>");
  sub=window.open(url,windowname,features);
  sub.focus();
}

function WinClose(){
  window.close();
}

function WinPrint(){
  window.print();
}