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<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==""){
  //Ò³Ãæ×ªÏò´úÂë
  }
}

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JScript code:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>


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  <div>
  <script type="text/javascript">
  function oo(a){
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>ÎÞ±êÌâÎĵµ </title>
<style type=" ......

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HTML code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Aja ......
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