jsp页面提交数据！！ 急！！！
各位大哥：
小弟刚学不久， 先遇到一个问题，请帮帮忙。
我在一个jsp页面作了一个多选。提交按钮用的是图片，这些多选项都是从数据库里面调出来的， 然后让客户选择提交，（xiao。jsp 他的配置文件是ctrlxiao。java 查询数据和提交都在这个java里面实现） 我把提交的内容也提交到这个java 上。 但是为什么提交的时候总是执行2次呢！！ 代码如下：

public class CtrlXdc extends Dispatcher {

public void dispatcher(HttpServletRequest request, HttpServletResponse response)
{

//读取当前方法
String Page=Req.getPara(request, "page ");
//网页加速功能
String webpagePath=admin.Lib.getStaticWebpagePath(request);
if(webpagePath!=null && !webpagePath.equals( " ")){ forward(request,response,webpagePath); return;}
//初始化系统(基本参数，配置参数，数据库连接参数)
Lib.init(request); //该函数中的ValidateUser(request)比较慢，以后再决定如何优化
DAO dao=new DAO();
request.setAttribute( "dao ",dao); //写到request中,系统就能自动关闭dao对象
//根据不同的方法调用不同的功能
if(Page.equals( "update_action ")){ actAction(dao,request,response); return;}
//actAction( dao, request, response);
if(Page.equals( " ")) xdc(dao,request,response);
//转到显示层
forward(request, response, "/channel/xdc.jsp ");
}

public void xdc(DAO dao,HttpServletRequest request, HttpServletResponse response)
{
//业务逻辑处理
request.setAttribute( "websiteLeftXWHD " ,Lib.GetLinkConetnt(dao, "music.website.leftxwhd ")); //相关下载频道的左侧页面

Map map=getAnswerMap(dao);
request.setAttribute( "questionMap ", map);
ArrayList list4=(map!=null?getOption(dao,map.get( "id ").toString()):null);
request.setAttribute( "arrOptions ",list4);
}


//获得在线调查问题名
public static Map getAnswerMap (DAO dao){
String sql = "select id from tbtool_question where is_visible=1 and is_over=0 and issuance=1 order by id desc limit 1 ";
String id = dao.conValue(sql);

Map questionMap = dao.conRow( "select * from tbtool_ques_item where is_need=1 and question_id= ' "+id+ " ' order by id desc limit 1 ");
return questionMap;
}
//获得在线调查选项
public static ArrayList getOption (DAO dao,String answerId){
ArrayList arrOptions= dao.conList( "select * from tbtool_ques_option where item_id= ' "+answerId+ " ' ");
return arrOptions;
}

public void actAction(DAO dao,HttpServletRequest request, HttpServletResponse response)
{
System.out.println( "dddddddd ");
String action=Req.getPara(request, "action ");
String [] result = request.getParameterValues( "test ");
String sql= " ";
int errcode;
int j=0;
if(action.equals( "update ")){
//int count=Integer.parseInt(Req.getPara(request, "count "));
String idList= " ";
//System.out.print( "12313316554 ");
for(int i=0;i <result.length;i++){
j=Integer.parseInt(result[i]);
/* if(!Req.getPara(request, "chk "+i).equals( " ") && Req.getPara(request, "chk "+i)!=null)
idList=idList+ ", "+Req.getPara(request, "result[i] ");
}
idList=idList.substring(0);*/

sql= "update tbtool_ques_option set clicks=clicks+1 where id= ' "+j+ " ' ";
errcode=dao.conExec(sql);

}

}

}
}


jsp页面：
<form method= "POST " action= " " target=_edit>
<tr>
<td colspan= "3 "> <img src= "image/diaocha1.gif " width= "153 " height= "20 " /> </td>
</tr>
<tr>
<td width= "8 " background= "image/bg-zhuangtai.gif "> </td>
<td width= "137 " height= "38 " valign= "top " bgcolor= "#2986b1 "> <table width= "131 " border= "0 " align= "center " cellpadding= "0 " cellspacing= "0 ">
<tr>
<td height= "130 " bgcolor= "#d6f5ff "> <table width= "100% " border= "0 " cellspacing= "0 " cellpadding= "0 " class= "index7 ">
<tr>
<td > <%=questionMap.get( "content ")%> </td>
</tr>
<tr>
<td >
<%for(int index=0;arrOptions!=null&&index <arrOptions.size();index++){
Map map=(Map)arrOptions.get(index);%>
<input type= "hidden " name= "count " value= " <%=index%> " >
<input type= " <%if(questionMap.get( "item_type ").toString().equals( "1 ")){out.print( "radio ");}else{out.print( "checkbox ");}%> " name= "test " value= " <%=map.get( "id ").toString()%> " /> <%=map.get( "content ").toString()%> <br>
<%} %>
</td>
</tr>
</table> </td>
</tr>

</table> </td>
<td width= "8 " background= "image/bg-zhuangtai1.gif "> </td>
</tr>
<tr>
<td height= "37 " colspan= "3 " align= "center " valign= "top " background= "image/diaocha2.gif "> <table width= "100% " border= "0 " cellspacing= "0 " cellpadding= "0 ">
<tr>
<td height= "35 " align= "center ">
<input type= "image " src= "image/tijiao.gif " width= "50 " height= "23 " onclick= "javascript:this.form.action= ' <%= "/channel/xdc.do "+ "?page= "+gloActionPage+ "&action=update "%> ';this.form.submit(); " />  
<a href= "diaocha.do " target= "_black "> <img src= "image/chakan.gif " width= "50 " height= "23 " border= "0 "/> </a>
</td>
</tr>
</table> </td>
</tr>
</form>

那为大哥可以仔细的说说啊！！ 如何做啊？

[解决办法]
<input type= "image " src= "image/tijiao.gif " width= "50 " height= "23 " onclick= "javascript:this.form.action= ' <%= "/channel/xdc.do "+ "?page= "+gloActionPage+ "&action=update "%> ';this.form.submit(); " /> 的onclick要么是javascript:this.form.action= ' <%= "/channel/xdc.do "+ "?page= "+gloActionPage+ "&action=update "%> ',要么是this.form.submit(),只能要一个就可以了
[解决办法]
同上
[解决办法]
up
[解决办法]
同上上
[解决办法]
<form method= "POST " action= " " target= "_blank ">