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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>ȫѡÓëÈ¡Ïûȫѡ</title>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
var checkInfo = function(objname){
 var cobjarr;
 var pobjarr;
 var operate = '_';   //IDÁ¬½Ó·û
 if ( typeof($('#'+objname+operate+'1').attr('id')) !== 'undefined' ){
  cobjarr = $('input[id^='+objname+operate+']');
  $(cobjarr).each( function(){
   $(this).attr('checked',$('#'+objname).attr('checked'));     
  });
 }
 
 if ( objname.indexOf(operate,0) == 1 ){
  var newobjarr = objname.split(operate);
  var newstr = '';
  
  for ( var i = 0; i < newobjarr.length-1; i++ ){
   newstr += newobjarr[i] + operate;
  }
  pobjarr = $('input[id^='+newstr+']');
  j = 0;
  $(pobjarr).each( function(){
   if ( !$(this).attr('checked') ){ 
    j++;
   }
  });
  var newstr1 = '';
  for ( var i = 0; i < newobjarr.length-1; i++ ){
   newstr1 += newobjarr[i] + operate;
   newstr2 = newstr1.substr(0,newstr1.length-1);
   if ( j != 0  ){
    $('#'+newstr2).attr('checked',false);   
   }else{
    $('#'+newstr2).attr('checked',true); 


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    <script language="javascript">
        function overlay() {
            xyz = document.getElementById("overlay");
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