请大神帮我分析一下为啥点击两次按钮才能正确执行

 <script language="javascript" type="text/javascript" src="DatePicker/WdatePicker.js"></script>

            请选择日期<input name="qw" id="d5221" class="Wdate" type="text" onFocus="var d5222=$dp.$('d5222');WdatePicker({onpicked:function(){d5222.focus();},maxDate:'#F{$dp.$D(\'d5222\')}'})"/>

至

<input id="d5222" name ="sa" class="Wdate" type="text" onFocus="WdatePicker({minDate:'#F{$dp.$D(\'d5221\')}'})"/>     <input type="submit" value="提交"/>

</form>

  <%

 QW=request.QueryString("qw") 

  sa=request.QueryString("sa") 

   %>

             			<%

if QW="" or sa="" then

Response.Write"没有您要查询的数据请重新查询！"

else

Response.Write "|查询日期：  "& QW &"到" &sa&"结果"

Set rs=server.CreateObject("ADODB.Recordset")