未显示反馈表

我试图构建一个ajax反馈表单,但在显示它时遇到了问题。显示反馈图像,但当我单击它时,什么也没有发生。

我的表格:

  <div id="feedback"> 
    <img id="feedback_link" src="images/feedback.gif" href="javascript:open('feedback_form_wrapper');" /> 

      <div id="feedback_form_wrapper" style="display:none;"> 
    <a class="close light" style="float:right;margin-right:5px;" href="javascript:open('feedback_form_wrapper');" >CLOSE</a> 
    <form id="feedback_form" action="." onsubmit="submit(); return false;"> 
      <div style="margin: 8px; width: 184px; float: left;"> 
        <select name="subject"> 
          <option value="bug">Found A Bug</option> 
          <option value="typo">Found A Typo</option> 
          <option value="other">Other</option> 
        </select> 
       Email:<br/> 
       <input type="text" class="email"  name="email" /><br/> 
      <textarea name="body" id="feedback_body" style="height: 180px; margin-top: 8px;">Enter Feedback Here.</textarea> 
    <input type="submit" class="input_submit_button" value="submit" /> 
      </div> 
    </form> 
      </div> 

  </div>

JavaScript:

function open(id){
    if (document.getElementById) { // DOM3 = IE5, NS6
        document.getElementById(id).style.display = 'block';
    }
    else {
        if (document.layers) { // Netscape 4
            document.id.display = 'block';
        }
        else { // IE 4
            document.all.id.style.display = 'block';
        }
    }
}

function close(id){
    if (document.getElementById) { // DOM3 = IE5, NS6
        document.getElementById(id).style.display = 'none';
    }
    else {
        if (document.layers) { // Netscape 4
            document.id.display = 'none';
        }
        else { // IE 4
            document.all.id.style.display = 'none';
        }
    }
}