PHP站点验证码不显示，速求大神帮助处理

1：网站根目录以设置 phpinfo.php

２：访问xxx/phpinfo.php  也显示开启GD库

3：代码如下：

<div class="control-group clearfix">    

<label class="control-label pull-left" for="inputVerify">验证码</label>    

<div class="controls pull-left">    

<input type="text" id="inputVerify" class="span3" placeholder="请输入验证码" errormsg="请填写5位验证码" nullmsg="请填写验证码" datatype="*5-5" name="verify">    

</div>    

</div>    

<div class="control-group1">    

<div class="controls">    

<img class="verifyimg reload-verify" alt="验证码" src="/index.php/user/user/verify.html" title="点击刷新">    

</div>    

<div class="controls Validform_checktip text-warning"></div>    

</div>