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 onchange="chg(document.f1.s1,document.f1.s2)">
 <option value="½­Î÷">½­Î÷</option>
 <option value="¸£½¨">¸£½¨</option>
</select><select name="s2">
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 function obj(aData, aValue, aText) {
  this.Data = aData;
  this.Value = aValue;
  this.Text = aText;
 }
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 var Set_data = new Array(
                       new obj('½­Î÷', 'Äϲý', 'Äϲý'),
                       new obj('½­Î÷', '¾Å½­','¾Å½­'),
                       new obj('¸£½¨', '¸£ÖÝ', '¸£ÖÝ'),
                       new obj('¸£½¨', 'ÏÃÃÅ', 'ÏÃÃÅ'));
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 function chg(parent, child) {
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  chgComitem(parent.options[parent.selectedIndex].value, child, Set_data);
 }
 function chgComitem(parentValue, child, objs) {
  //¸Ä±ä×Ӳ˵¥ //1.ÒÔ×Ӳ˵¥Îª²ÎÊýµ÷Óú¯Êý 
  DelAllComitem(child);
  //2.±éÀúËùÓеÄÑ¡ÏîÊý¾Ý 
  for (i = 0; i < objs.length; i++) {
   //Èç¹ûÑ¡ÏîÊý¾ÝµÄDataÓ븸²Ëµ¥Ñ¡ÖÐÖµÒ»ÑùµÄ»°  
   if (objs[i].Data == parentValue)
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