刷新简单的验证码

<script type="text/javascript">    function reloadCaptcha(){        var d = new Date();        $("#captcha_image").attr("src", "/captcha_generator.jsp?"+d.getTime());    }</script>   ...<img id="captcha_image" src="/captcha_generator.jsp" alt="captcha image" width="200" height="50"/><img src="reload.jpg" onclick="reloadCaptcha()" alt="reload"width="40" height="40"/>