<td>验证　码：</td>
                        <td><input type="text" name="checkCode" id="checkCode" maxlength="4" />
                             <a href="#" onclick="document.getElementById('codeImg').src='handler/checkCode.ashx?temp='+ (new Date().getTime().toString(36)); return false">
                            <script type="text/javascript">
                                document.write('<img id="codeImg" height="35px" border="0" style="vertical-align:top;" alt="看不清，点击换一张！" src="handler/checkCode.ashx?temp=' + (new Date().getTime().toString(36)) + '" />');
                            </script>
                            </a>
                        </td>