获取子页面的值

父页面
 //查询客户资料信息
        function getDownListData(GuestName)
        {
            var pos,str,para,parastr,tempstr1; 
            tempstr=""; 
            str = window.location.href; 
            pos = str.indexOf("?") 
            parastr = str.substring(pos+1);  
            
             var result =window.showModalDialog("selectGuestwc.aspx?GuestName="+escape(GuestName)+"&"+parastr,"","dialogWidth:800px;dialogHeight:600px;scroll:yes;help:0;status:no;");
             if(result!=undefined)
             {
                     document.getElementById("txtselecName").innerText=result.split(',')[0];
                    
子页面
 function selectInfo(name)
        {
            window.returnValue =name;
            window.close();
        }
现在问题是:
      子页面里分页时,点击下一页会弹出一个页面,浏览输入框内容
javascript:__doPostBack('PageNavigator1$lnkbtn1','')