Jquery checkbox

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>

 <HEAD>

  <TITLE> New Document </TITLE>

  <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<script language='javascript' src='http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js'></script>

  <SCRIPT LANGUAGE="JavaScript">

  <!--

   $("document").ready(function(){

    

    $("#btn1").click(function(){

     

    $("[name='checkbox']").attr("checked",'true');//全选

  

    })

       $("#btn2").click(function(){

     

    $("[name='checkbox']").removeAttr("checked");//取消全选

  

    })

    $("#btn3").click(function(){

     

    $("[name='checkbox']:even").attr("checked",'true');//选中所有奇数

  

    })

    $("#btn4").click(function(){

     

    $("[name='checkbox']").each(function(){

     

   

     if($(this).attr("checked"))

   {

    $(this).removeAttr("checked");

    

   }

   else

   {

    $(this).attr("checked",'true');

    

   }

   

    })

  

    })

     $("#btn5").click(function(){

    

    var str="";

    $("[name='checkbox'][checked]").each(function(){

      str += $(this).val();

      alert(str);

    })



    })

   })

  //-->

  </SCRIPT>

  

 </HEAD>



 <BODY>

 <form name="form1" method="post" action="">

   <input type="button" id="btn1" value="全选">

   <input type="button" id="btn2" value="取消全选">

   <input type="button" id="btn3" value="选中所有奇数">

   <input type="button" id="btn4" value="反选">

   <input type="button" id="btn5" value="获得选中的所有值">

   <br>

   <input type="checkbox" name="checkbox" value="checkbox1">

   checkbox1

   <input type="checkbox" name="checkbox" value="checkbox2">

   checkbox2

   <input type="checkbox" name="checkbox" value="checkbox3">

   checkbox3

   <input type="checkbox" name="checkbox" value="checkbox4">

   checkbox4

   <input type="checkbox" name="checkbox" value="checkbox5">

   checkbox5

   <input type="checkbox" name="checkbox" value="checkbox6">

   checkbox6

   <input type="checkbox" name="checkbox" value="checkbox7">

   checkbox7

   <input type="checkbox" name="checkbox" value="checkbox8">

 checkbox8

 </form>

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