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<html>
<head>
</head>
<script>
function countme(obj,div_id,pre_id){
  if(obj.value!=''){
  //ǰһ¸öÖµ
  var preval = document.getElementById(pre_id).value;
  //µ±Ç°divÖµ
  var t = document.getElementById(div_id+'_value').value;

  //ÏÔʾ
  document.getElementById(div_id).innerHTML = parseInt(t) + parseInt(obj.value) - parseInt(preval);
  //¸³Ç°Ò»¸öÖµ
  document.getElementById(pre_id).value = obj.value;
  //¸³µ±Ç°divÖµ
  document.getElementById(div_id+'_value').value = parseInt(t) + parseInt(obj.value) - parseInt(preval);
   
}
}
</script>
<body>
<form>
  <table colspan="1" border="1">
  <tr>
  <td>id1aaa</td>
  <td>id2aaa</td>
  <td>textaaa</td>
  <td>totalaaa</td>
  </tr>
  <tr>
  <td>id1</td>
  <td>id2</td>
  <td><input type="hidden" id="pre_id1_id2_text1_value" value="0"/><input type="text" on


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