自己写的jQuery 左右选择框,大家多多指教!

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">  
<HTML>  
 <HEAD>  
  <TITLE> New Document </TITLE>  
  <META NAME="Generator" CONTENT="EditPlus">  
  <META NAME="Author" CONTENT="">  
  <META NAME="Keywords" CONTENT="">  
  <META NAME="Description" CONTENT="">  
  <script type="text/javascript" src="http://code.jquery.com/jquery-1.4.2.min.js"></script>  
  
  <style>  
  .sel{width:150px;height:200px;}  
  .btn{width:50px;font-weight:bold;font-size:14px; }  
  </style>  
 </HEAD>  
  
 <BODY>  
 <table>  
    <tr>  
        <td>  
          <select multiple class="sel" id="sel_left">  
            <option value="a">aaaaaaaaaaa</option>  
            <option value="b">bbbbbbbbbbb</option>  
            <option value="c">ccccccccccc</option>  
            <option value="d">ddddddddddd</option>  
            <option value="e">eeeeeeeeeee</option>  
          </select>  
        </td>  
        <td>    
            <p><button class="btn" id="btn_1">&gt;&gt; </button></p>  
            <p><button class="btn" id="btn_2">&gt;</button></p>  
            <p><button class="btn" id="btn_3">&lt;</button></p>  
            <p><button class="btn" id="btn_4">&lt;&lt;</button></p>  
              
        </td>  
        <td>  
             <select multiple class="sel" id="sel_right">  
             <option value="f">fffffffffff</option>  
             </select>  
        </td>  
    </tr>  
</table>  
 </BODY>  
   <script>  
  $(function(){  
    $("#sel_left,#sel_right").bind("change",checkBtn);  
    $("#btn_1,#btn_2,#btn_3,#btn_4").bind("click",clickBtn);  
    checkBtn();  
    });  
      
    function checkBtn(){  
        jQuery("#sel_left>option").length > 0 ? jQuery("#btn_1").removeAttr("disabled") : jQuery("#btn_1").attr("disabled","disabled");  
        jQuery("#sel_left option:selected").length > 0 ? jQuery("#btn_2").removeAttr("disabled") : jQuery("#btn_2").attr("disabled","disabled");  
        jQuery("#sel_right option:selected").length > 0 ? jQuery("#btn_3").removeAttr("disabled") : jQuery("#btn_3").attr("disabled","disabled");  
        jQuery("#sel_right>option").length > 0 ? jQuery("#btn_4").removeAttr("disabled") : jQuery("#btn_4").attr("disabled","disabled");  
    }  
      
    function clickBtn(e){  
        if("btn_1" == e.target.id){  
            jQuery("#sel_left>option").appendTo("#sel_right");  
        }else if("btn_2" == e.target.id){  
            jQuery("#sel_left option:selected").appendTo("#sel_right");  
        }else if("btn_3" == e.target.id){  
            jQuery("#sel_right option:selected").appendTo("#sel_left");  
        }else if("btn_4" == e.target.id){  
            jQuery("#sel_right>option").appendTo("#sel_left");  
        }  
        checkBtn();  
    }  
  </script>  
</HTML>

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