javascript点击才出现验证码

<% 
if request("cur_action")="add" then 
code=Request.Form("code")  
if code=empty then 
response.write "<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%20LANGUAGE%3D'javascript'%3Ealert('%E8%AF%B7%E8%BE%93%E5%85%A5%E9%AA%8C%E8%AF%81%E7%A0%81%EF%BC%81')%3Bhistory.go(-1)%3B%3C%2Fscript%3E">" 
Session("GetCode")=empty 
response.End() 
elseif lcase(code)<>lcase(Session("GetCode")) then 
response.write "<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%20LANGUAGE%3D'javascript'%3Ealert('%E6%82%A8%E8%BE%93%E5%85%A5%E9%AA%8C%E8%AF%81%E7%A0%81%E5%87%BA%E9%94%99%EF%BC%81')%3Bhistory.go(-1)%3B%3C%2Fscript%3E">" 
Session("GetCode")=empty 
response.End() 
Else 
Response.Write "<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%3Ealert('%E7%99%BB%E9%99%86%E6%88%90%E5%8A%9F')%3Bhistory.back()%3B%3C%2Fscript%3E">"          
response.End() 
end if 
end if 
%> 
<form name="form" method="post" action="index.asp"> 
<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3CSCRIPT%20LANGUAGE%3Djavascript%3E%20%0D%0A%2F*%E6%98%BE%E7%A4%BA%E8%AE%A4%E8%AF%81%E7%A0%81%20o%20start1*%2F%20%0D%0Afunction%20get_Code()%20%7B%20%0D%0A%20%20%20%20%20%20%20%20var%20Dv_CodeFile%20%3D%20%22http%3A%2F%2Fwww.glzy8.com%2Finc%2Fgetcode.asp%22%3B%20%0D%0A%2F%2F%E8%BF%99%E4%B8%AA%E5%9C%B0%E6%96%B9%E9%9C%80%E8%A6%81%E6%8D%A2%E8%BD%A6%E4%BD%A0%E7%BD%91%E7%AB%99%E5%AE%9E%E9%99%85%E7%9A%84%E5%9C%B0%E5%9D%80%20%0D%0A%20%20%20%20%20%20%20%20if(document.getElementById(%22imgid%22))%20%0D%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20document.getElementById(%22imgid%22).innerHTML%20%3D%20'%3Cimg%20src%3D%22'%2BDv_CodeFile%2B'%3Ft%3D'%2BMath.random()%2B'%22%20alt%3D%22%E7%82%B9%E5%87%BB%E5%88%B7%E6%96%B0%E9%AA%8C%E8%AF%81%E7%A0%81%22%20style%3D%22cursor%3Apointer%3Bborder%3A0%3Bvertical-align%3Amiddle%3Bheight%3A18px%3B%22%20onclick%3D%22this.src%3D%5C''%2BDv_CodeFile%2B'%3Ft%3D%5C'%2BMath.random()%22%20%2F%3E'%20%0D%0A%7D%20%0D%0A%2F*o%20end*%2F%20%0D%0A%3C%2Fscript%3E"> 
<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%20language%3D%22JavaScript%22%20type%3D%22text%2Fjavascript%22%3E%20%0D%0Avar%20dvajax_request_type%20%3D%20%22GET%22%3B%20%0D%0A%3C%2Fscript%3E"> 
<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%20language%3D%22JavaScript%22%20src%3D%22dv_ajax.js%22%20type%3D%22text%2Fjavascript%22%3E%3C%2Fscript%3E"> 
<tr> 
  <td style="width:100px; text-align:right">验证码：</td> 
  <td style="width:150px; text-align:left"> 
    <p> 
      <input type="text" name="code" id="code" size="4" maxlength="4" tabindex="6" onfocus="get_Code();this.onfocus=null;" onkeyup="dv_ajaxcheck('checke_dvcode','code');" /> 
    <span id="imgid" style="color:red">点击获取验证码</span><span id="isok_code"></span></p> 
    
   <input name="cur_action" type="hidden" value="add"> 
   <input name="提交" type="submit" id="提交"> 
   </td> 
</tr> 
</form>

　　 [Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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