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function countme(obj,div_id,pre_id){
  if(obj.value!=''){
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  document.getElementById(pre_id).value = obj.value;
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}
}
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<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>
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