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<input type ="text"name="name1" id="1">
<input type ="text"name="name1" id="2">
<input type ="text"name="name1" id="3">
<input type ="text"name="name1" id="4">

window.onload = function(){
    var input3 = document.getElementById('3');
    if(input3.value != ""){
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};

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var txts=document.getElementsByName("name1");
if(txts.length>1){
  if(txts[2].value!=""&&txts[0].value==""&&txts[1].value==""){
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  }
}

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  <div>
  <script type="text/javascript">
  function oo(a){
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function formatDate(D)
{//µ÷Õûʱ¼äÏÔʾ¸ñʽ2007-01-01 12:00:00
return D.g ......

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