deleting messages using checkbox in JSP

Am working on a Mail Server Project. In that I have Inbox And Outbox Messages. Now Each and Every message is deleting correctly in my project. But Problem occurs when i use to delete the last message left in both in/out box. i have done the validations which says an alert while i directly click on button(which it should show) without checking it but if during last message left in mail and its already checked;i click on button it shows an error. A when there is no message in it and i click on delete its showing jasper error(Instead of showing 'there is no message in outbox/inbox'). am posting my code also.....

<html>
<head>
<script>
    function ValidateForm()
    {
        var flag = false;
        for(i=0;i< document.frm.inboxchk.length;i++)
        {
            if(document.frm.inboxchk[i].checked)
                flag = true;
        }

        if(!flag)
        {
            alert('Please select Mails');
            return false;
        }
        return true;
    }
</script>
</head>
<body>
<form action="DeleteOutbox.jsp" method="post" name="frm" onsubmit="return ValidateForm();">

outbox.jsp

<%@ page import="java.sql.*"%>
<%@ page import="javax.sql.*"%>
<%@ page import="java.io.*"%>
<%@ page import="java.io.File"%>
<%@ page import="java.util.*"%>
<%

    PMS.common.PMSDBManager obj = new PMS.common.PMSDBManager();
    String sesUserId=(String)session.getAttribute("UserId");
    if(sesUserId == null)
    {   
        response.sendRedirect("Login.jsp");
    }
    else
    {   
        String empid=request.getParameter("empid");
        if(sesUserId == null)
        {   
            response.sendRedirect("Login.jsp");
        }


        Calendar cal = Calendar.getInstance();
        String CurrentTime = cal.get(Calendar.HOUR) + ":" + cal.get(Calendar.MINUTE) + ":" + cal.get(Calendar.SECOND);
        String CurrentDate = cal.get(Calendar.YEAR) + "/" + (cal.get(Calendar.MONTH)+1) + "/" + cal.get(Calendar.DATE);
        String sql="SELECT * FROM mstOutbox WHERE fromuid='"+sesUserId+"' AND dstatus='N'";
        ResultSet rs=obj.getResultSet(sql); 

%>  <center><i><h4>OUTBOX:</h4></i>
    <table BORDER="1" CELLPADDING="2">
    <tr>    <td></td>
        <td>Subject</td>
        <td>To</td>
        <td>Date</td>
        <td>Time</td>
    <tr>
<% 

    while(rs.next())
    { 
        int frmid=rs.getInt("touid");
        String sql1="SELECT * FROM mstRegistration WHERE userid='"+frmid+"'";
        ResultSet rs1=obj.getResultSet(sql1);
        while(rs1.next())
        {
        %>
    <tr>    <td><input type="checkbox" name="inboxchk" value="<%=rs.getInt("omailid")%>"></td>
        <td><h4><i><a href="Displaymail.jsp?empid=<%=rs.getInt("omailid")%>&userid=<%=rs1.getString("userid")%>&outbox=Y" target="middle_pane"><%out.println(rs.getString("subject"));%></a></i></h4></td>
        <td><h4><i><%out.println(rs1.getString("firstname"));%></i></h4></td>
        <td><h4><i><%out.println(rs.getString("date"));%></i></h4></td>
        <td><h4><i><%out.println(rs.getString("time"));%></i></h4></td>
    </tr>
<%}}
%>
    </table>
    <input type="submit" name="delete" value="Delete Mail" onClick="return ValidateForm();">
    </center>
</form>
</body>
</html>
<%}%>

deleteout.jsp


<%@ page import="java.sql.*"%>
<%@ page import="javax.sql.*"%>
<%@ page import="java.io.*"%>
<%@ page import="java.io.File"%>
<%
    PMS.common.PMSDBManager obj = new PMS.common.PMSDBManager();
    String sesUserId=(String)session.getAttribute("UserId");
    if(sesUserId == null)
    {   
        response.sendRedirect("Login.jsp");
    }
    else
    {   

        String[ ] touserId = request.getParameterValues("inboxchk");
        boolean booln = false;
        for(int i=0;i<touserId.length;i++)
        {
            System.out.println("IN DELETE PAGE OF OUTBOX>>>>>>>>>>>>>>>>>>"+touserId[i]);

            String delsqlinx = "UPDATE mstOutbox SET dstatus='Y' WHERE omailid='"+touserId[i]+"' AND fromuid='"+sesUserId+"'";

            booln = obj.executeQuery(delsqlinx);
        }
        response.sendRedirect("Outbox.jsp");
}%>

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