combobox

i have three tables in database country,state and city ...when i selected country ten only state show of that country similarly city depends on state i have implmnt dis code and it work propely bt problem is the field which inserted a value before country become erase \when selected country...plz help me sir

<%@page import="java.sql.*" %>
<html>
<head>
<title>New User Registration</title>
</head>
<body bgcolor="#CCFFFF">
<CENTER>
<H1> <u>EDUCATIONAL DATABASE SYSTEM</u> </H1>
</CENTER>
<a href="login.html">Home Page</a>

<%
String strcountrycode = "0";
String strstatecode = "0";
String strcitycode = "-1";

String strstatename = "";
String strcountryname = "";
String strcityname = "";


//checking the state code
if (request.getParameter("param1") != null){
strcountrycode=request.getParameter("param1").trim();
}

if (request.getParameter("param2") != null){
strstatecode=request.getParameter("param2").trim();
}

if (request.getParameter("param3") != null){
strcitycode=request.getParameter("param3").trim();
}%>

<script language="JavaScript" type="text/JavaScript">


//-->
//function for changing the url
function ChangeURL1(FileName,param1){
location.href=FileName + ".jsp?param1=" + param1;
}
function ChangeURL2(FileName,param1,param2){
location.href=FileName + ".jsp?param1=" + param1 + "&param2=" + param2;
}

function ChangeURL3(FileName,param1,param2,param3){
location.href=FileName + ".jsp?param1=" + param1 + "&param2=" + param2 + "&param3=" + param3;
}


  function validate()
  {
  if( document.kk.email.value=="")
  {
  alert("Email cannot be blank");
  return;

  }

  if( document.kk.name.value=="")
  {
  alert(" Name cannot be blank");
  return;

  }
  if( document.kk.phone.value=="")
  {
  alert("Phone Number cannot be blank");
  return;
  }
   if( document.kk.sta.value=="select state")
  {
  alert("You must select a state");
return;
  }


  if( document.kk.address.value=="")
  {
  alert("Address cannot be blank");
  return;
  }



  if( document.kk.pinCode.value=="")
  {
  alert("PinCode cannot be blank");
 return;
  }


  }

 </script>
<form name="kk" method="POST" action="signup.jsp">
           <%
         Connection conn=null;
    try
    {
            ResultSet rs,rm=null;
        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        conn =DriverManager.getConnection("jdbc:odbc:neha");
                PreparedStatement stat,yu;%>


     <p align="center">
  <b><font size="5"> New User Registration</font></b>&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  </p>

  <div align="left">
    <table border="0" width="100%">
      <tr>
        <td width="23%"><b>Email *:</b></td>
        <td width="77%">
            <b>
      <input type="text" name="email" size="20" tabindex="1">
            </b>
        </td>
      </tr>

      <tr>
        <td width="23%">
            <b>
             Name*:</b></td>
        <td width="77%">
            <b><input type="text" name="name" size="20" tabindex="4">
            </b>
        </td>
      </tr>
      <tr>
        <td width="23%" height="25"><b>Phone Number*:</b></td>
        <td width="77%" height="25"><b><input type="text" name="phone" size="20" tabindex="13"> </b> </td>
      </tr>

      <tr>
        <td width="23%" height="25"><b>Country*:</b></td>
        <td width="77%" height="25">
          <select name="count" class="Textbox" onChange="ChangeURL1('userentry',document.kk.count.options[document.kk.count.selectedIndex].value);">
           <option value=''>select country</option>
              <%
                stat=conn.prepareStatement("SELECT country,countryID FROM mast_country ");

        rs = stat.executeQuery();
        while(rs.next())
        {

            String str1,str2;
                        str2=rs.getString("countryID");
            str1=rs.getString("country");
                    if(strcountrycode.equals(str2)) {
                      strcountrycode=str2;
                      strcountryname=str1;
                    %>
                    <option value="<%out.println(str2);%>" selected><% out.println(str1); %>
                        </option>
                        <%
                    }else{%>

                    <option value="<%out.println(str2);%>"><% out.println(str1); %>
                        <%

                    }
        }if(rs!=null){
                    rs.close();
                    rs=null;
                }

              %>
            </select>
</tr><tr>
        <td width="23%" height="25"><b>state*:</b></td>
        <td width="77%" height="25"><b>

<select name="sta" class="Textbox" onChange="ChangeURL2('userentry',document.kk.count.options[document.kk.count.selectedIndex].value,document.kk.sta.options[document.kk.sta.selectedIndex].value);">
            <option value=''>select state</option>
                 <%
                 yu= conn.prepareStatement("SELECT state,stateID FROM mast_state where countryID="+strcountrycode+" ");
                 rs = yu.executeQuery();
                  while(rs.next())
        {
            String str3,str4;
            str3=rs.getString("state");
                        str4=rs.getString("stateID");
                 if(strstatecode.equals(str4)) {
                      strstatecode=str4;
                      strstatename=str3;
                  %>
                  <option value="<%out.println(str4);%> " selected >"<%out.println(str3);%>"</option>
                 <%
                 }
                  else{%>

                  <option value="<%out.println(str4);%>"><% out.println(str3); %></option>

                  <%}


        }if(rs!=null){
                    rs.close();
                    rs=null;
                }

%>
</select></b></td>

      </tr>
      <tr>
        <td width="23%" height="25"><b>City*:</b></td>
        <td width="77%" height="25"><b>
        <select name="cty" class="Textbox" onChange="ChangeURL3('userentry',document.kk.count.options[document.kk.count.selectedIndex].value,document.kk.sta.options[document.kk.sta.selectedIndex].value,document.kk.cty.options[document.kk.cty.selectedIndex].value);">
            <option value=''>select city</option>
                 <%
                 yu= conn.prepareStatement("SELECT city,cityID FROM mast_city where stateID="+strstatecode+" ");
                 rs = yu.executeQuery();
                  while(rs.next())
        {
            String str5,str6;
            str6=rs.getString("city");
                        str5=rs.getString("cityID");
                 if(strcitycode.equals(str5)) {
                      strstatecode=str5;
                      strstatename=str6;
                  %>
<option value="<%out.println(str5);%>" selected>"<%out.println(str6);%>"</option>
                 <%
                 }
                  else{%>

                  <option value="<%out.println(str5);%>"><% out.println(str6); %></option>

                  <%}


        }if(rs!=null){
                    rs.close();
                    rs=null;
                }

%></select>

        </b> </td>
      </tr>
       <tr>
        <td width="23%" height="25"><b>Place*:&nbsp;</b></td>
        <td width="77%" height="25"><b><input type="text" name="place" size="20" tabindex="11"> </b> </td>
      </tr>
      <tr>
        <td width="23%" height="25"><b>Pin Code*:&nbsp;</b></td>
        <td width="77%" height="25"><b><input type="text" name="pinCode" size="20" tabindex="11"> </b> </td>
      </tr>
        <tr>
        <td width="23%" height="25"><b>Address*:&nbsp;&nbsp;</b></td>
        <td width="77%" height="25"><b><input type="text" name="address" size="43" tabindex="7"> </b> </td>
      </tr>


      <tr>
        <td width="23%" height="1"></td>
        <td width="77%" height="1"> </td>
      </tr>
      <tr>
        <td width="23%" height="21"></td>
        <td width="77%" height="21">
   <b>
   <input type="submit" value="Submit" name="B1" onclick = "validate();" tabindex="13">
   </b>
 </td>
      </tr>
    </table>
  </div>


            <%
        }
    catch(Exception E)
    {
        System.out.println("error");
    }%>

</form>


</body>

</HTML>
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