jquery 设置按钮停顿3秒

<!DOCTYPE html>
<html>
    <head>
        <title> my name is lian lily</title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> 
        <script type="text/javascript">

            var times = 0
            function show(obj) {
                $("#btn_"+obj).attr("disabled","disabled");//设置button不可用
                 times++;
                 if(times == 2){
                    alert(obj);
                    times = 0;
                    $("#btn_"+obj).removeAttr("disabled");
                    return ;
                 }
                 //$("#frm"+obj).submit();
                 setTimeout("show("+obj+")" , 3000);
            }
        </script>
    </head>

    <body>
        <form action ='post.php'  method="post" name="frm1" id="frm1"> 
             <input type="button" name="btn_1"  id="btn_1" value="提交1" onclick="show(1)" />
        </form>
        
        <form action ='post.php'  method="post" name="frm2" id="frm2">
             <input type="button" name="btn_2"  id="btn_2" value="提交2" onclick="show(2)"/>
        </form>
    </body>
</html>

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