//------------------------------------------------------------------------
//**根据具体数值选择下拉菜单*/
function SelectOptions(form,val){
  var i;
  for(i = 0; i<form.length; i++)
    if(form.options[i].value == val)
      form.options[i].selected = true;
}
//------------------------------------------------------------------------
//**数字式下拉菜单*/
function WriteNumberOption(startNum,endNum){
  for(var i = startNum; i <= endNum; i++)
    document.write("<option value='"+i+"'>"+i+"</option>");
}
//-----------------------------------------------------------------------
//**二级菜单生成*/
function WriteSubOptions(MainForm,MainArray,SubForm,SubArray){
  var m,n,i,j;
  m = MainForm.selectedIndex - 1;
  n = SubForm.length;
  for(i=n-1;i>0;i--)
    SubForm.options[i] = null;
  j = 1;
  for(i=0;i<SubArray.length;i++)
    if(SubArray[i][2] == MainArray[m][2])
      SubForm.options[j++] = new Option(SubArray[i][0],SubArray[i][1]);
  SubForm.options[0].selected = true;
}