function addOption(objSelectNow,txt,val)
 {
  /// 使用W3C标准语法为SELECT添加Option
  var objOption = document.createElement("OPTION");
  objOption.text= txt;
  objOption.value=val;
  objSelectNow.options.add(objOption);
 }
 function addOptionGroup(selectId,optGroupString)
 {
  var optGroup = optGroupString.split(",");

  var objSelect = document.getElementsByTagName("SELECT");
  var objSelectNow = objSelect[selectId];
  objSelectNow.length = 1;
     /// 成组添加Options
  for (i=1; i<optGroup.length; i++)
  {
   addOption(objSelectNow, optGroup[i], i);
  }
 }