var calc;
  function popupcalc(form, input)
  {
  // check the IE version
  if(navigator.appName == 'Microsoft Internet Explorer') {
    var index = navigator.appVersion.indexOf("MSIE");
    var version = parseInt(navigator.appVersion.substring(index + 5, index + 8));
    if(6 > version) {
      if(calc) calc.close();
      }
    }
  var url = "../calculator/index.html?bgcolor=";
  url += "005AAA";
  if(form) { url += "&form=" + form; }
  if(input) { url += "&input=" + input; }
  calc = open(url, "calculator", "width=250,height=345");
  calc.focus();
  }