Showing the same page after savin

Question

hi!!! i m creating website ...i m using ajax.When the page loads..there are 2 combo box one for state and other for city.on select of state city will get populated and on select of city my age will dynamically generate textbox along with combo box.This dynamically generated textbox will contain all the pincode for a particular selected city. and the combo box will contain all the username .
My problem starts here...
1.Once i click on save the data is saved but the dynamically created textbox and combo box goes off leaving behind only the 2 static combo box.
2.While saving if the user selects the state as maharashtra and city and mumbai.he will get to see..list of pincodes available for mumbai.from that list if he selects the pincode ans 400706 and some "xyz" user from the username(combo).and clicks on save.data is saved.but next if he selects the same state and city then the previoulsy saved data ie for pincode 400706 the respective combo shld hav "xyz" as selected..
for showing the selection i have used some thing like this ...but this dosen't seemd to work<%ArrayList userlist=(ArrayList)request.getAttribute("USERLIST");
object.operations.UserObject obj=new object.operations.UserObject();
int size=userlist.size();
System.out.println("Size is :-->jsp of userlist"+size);%>
    function processRequest()
          document.getElementById(ele).options.length = 0;
document.getElementById(ele).options[0] = new Option("Select "+ ele,"0");          
        if (req.readyState == 4)
            if(req.status == 200)
                //get the text send by the servlet
                textToSplit = req.responseText;
                     //Split the document
                returnElements=textToSplit.split("||")
                    for ( var i=0; i<returnElements.length; i++ )
                         valueLabelPair = returnElements.split(";")
                         if(valueLabelPair[0]=="") break;
                         document.getElementById(ele).options[i+1] = new
Option(valueLabelPair[1], valueLabelPair[0]);
var ct=valueLabelPair[1];
                         var rows=document.getElementById("pinTabel").rows.length;
                         var oCell.innerHTML=<input type='text' name='pincode'
value='+valueLabelPair[0]+'>;
                         var oCell.innerHTML=<select><option value=''>Select
user</option><%for(int j=0;j<size;j++)
obj=(object.operations.UserObject)userlist.get(j);%><option
value='<%=obj1.getUserId()%>' if(<%=obj1.getUserId()%>==ct){selected}><%=obj1.getfirstName()%></option>%></select>;
else
alert("Error loading page\n"+ req.status +":"+ req.statusText);
3.is there any way out for showing  the values saved by the user along with the static combobox.so that i would be helpful for the users.
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Answer 1

Onur - Why not just set a package variable or an item in session state to indicate that there was an error and have the page branch back to itself using a Branch to Page branch (one that does not redirect)? The page would then show the error message if the package variable or item were set.
Scott