struts查询数据如何跳转到iframe显示

需要得到的效果是
当我们在输入培训日期或者培训类别或培训截止日期后，在下面的iframe中显示查询的信息。如何跳转，不知道改如何修改。麻烦各位解答。谢谢了。
采用struts框架。
页面请求页面 
<body scroll ="yes">
        <table style="padding-top: 3px">
            <tr>
                <td colspan="3" class="position">您的当前位置： </td>
            </tr>
        </table>        <form  name="myform" id="myform" action="${base}/searchPx.do" target="_self" method="post"  onsubmit="return validate();">
            培训类别<input class="field" name="pxlbmean"  ondblclick="openPxCodeWindow()" id="meanInput" ><input type="hidden" name="pxlb" id="codeInput" />
            &nbsp;
            起始日期
            <input type="text" class="field" name="sdate"/>
            &nbsp;
            截止日期
            <input type="text" class="field"  name="edate"/>
            <input type="submit" value="" class="searchButton" />
        </form>
        <iframe src="${base}/viewpx.do"  width="700" height="400">
        </iframe>
        action类  public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {        SubUser user = (SubUser) request.getSession().getAttribute("user");
        ITrainService trs = (ITrainService) Container.getInstance(ITrainService.class);
        List list = trs.searchTrainByPxlb(request.getParameter("pxlb"), request.getParameter("sdate"), request.getParameter("edate"), user);
        request.setAttribute("list", list);
   //     return mapping.findForward("success");
        return new ActionForward("/jdcx/searchpx.jsp");    }配置文件 <action path="/searchPx" type="com.hykj.ms.action.search.SearchTrain">
     <forward name="success"  path="/jdcx/train/viewpx.jsp" />
        </action>
        <action path="/viewpx" forward="/jdcx/train/viewpx.jsp"/>显示页面   <table border="0" cellpadding="0" cellspacing="0" >            <tr><td class="tableLeftUpAngle"></td><td class="tableUp"></td><td class="tableRightUpAngle"></td></tr>
            <tr><td class="tableLeft"></td><td>                    <table class="shadowTable" cellpadding="0" cellspacing="0" >
                        <tr>
                            <th>姓名</th>
                            <th>培训类别</th>
                            <th>起始日期</th>
                            <th>截止日期</th>
                            <th>培训完成情况</th>                        </tr>                        <c:forEach varStatus="sta" var="item" items="${list}" >
                            <c:if test="${sta.index>0}" >
                                <tr>
                                    <td>${item[0]}</td>
                                    <td>${myfun:getMean(item[1],'zb29_pxlb')}</td>
                                    <td>${item[2]}</td>
                                    <td>${item[3]}</td>
                                    <td>${myfun:getMean(item[4],'zb28_xxwc')}</td>
                                </tr>
                            </c:if>
                        </c:forEach>                    </table>
                </td><td class="tableRight"></td></tr>
            <tr><td class="tableLeftBottomAngle"></td><td class="tableBottom"></td><td class="tableRightBottomAngle"></td></tr>        </table>