EJB and JSP. Strange behaviour with buttons

I have an EJB (called Vault) which (apart from all the essential stuff) contains only:
public String getIndex()
return Integer.toString(++index);
private int index = 0;
I have a page which displays three buttons. Each time a button is clicked, the EJB getIndex() is called, and the value reported. I would expect to get the sequence of numbers 1, 2, 3, 4, ... whenever any button is clicked. And so I do, until I change to a previously clicked button when it displays the same value it displayed when that button was last clicked! In this case, not only does the EJB give the wrong answer, but System.out.println gives no output! (Same problem?) Pressing the button again gives the expected value from the sequence. Continually clicking the same button gives the expected result.
This is a simplified version of code that was presenting a similar problem; on re-pressing a button, old data was being displayed.
HTML/JSP code below.
Any insights would be greatly appreciated.
John
Frame page defines javascript for three buttons:
<HTML>
<HEAD>
<TITLE>Vault</TITLE>
<SCRIPT LANGUAGE="JavaScript">
<!-- Hiding Script
function fnAction(action)
var str = "DisplayData.jsp?Action=" + action;
treeFrame.location.href=str;
function one()
fnAction("doOne");
function two()
fnAction("doTwo");
function three()
fnAction("doThree");
// end hiding script -->
</SCRIPT>
</HEAD>
<FRAMESET onLoad="initialize()" FRAMEBORDER="0" FRAMESPACING="0"
BORDER="0" rows="250, *">
<FRAME SRC="Browse.html" NAME="treeFrame">
</FRAMESET>
</HTML>
Initial page Browse.html
<HTML>
<HEAD>
<TITLE>Browse</TITLE>
</HEAD>
<BODY>
<form>
<INPUT TYPE=BUTTON OnClick="javascript:top.one()" VALUE="1">
<INPUT TYPE=BUTTON OnClick="javascript:top.two()" VALUE="2">
<INPUT TYPE=BUTTON OnClick="javascript:top.three()" VALUE="3">
</form>
</BODY>
</HTML>
DisplayData.jsp
JSP page used to call EJB functions:
<%@ page import="webvault.Vault,webvault.VaultHome,javax.ejb.*,
java.math.*, javax.naming.*, javax.rmi.PortableRemoteObject,
java.rmi.RemoteException" %>
<HTML>
<HEAD>
<TITLE>DisplayData</TITLE>
<SCRIPT LANGUAGE="JavaScript">
</SCRIPT>
</HEAD>
<BODY>
<%!
private Vault vault = null;
public void jspInit()
try
InitialContext ic = new InitialContext();
Object objRef =
ic.lookup("java:comp/env/ejb/webvault/TheVault");
VaultHome home =
(VaultHome)PortableRemoteObject.narrow(objRef, VaultHome.class);
vault = home.create();
catch (Exception ex)
System.out.println("jspInit exception: " +
ex.getMessage());
String handleAction(String action)
StringBuffer sb = new StringBuffer(action);
try
sb.append("\nVault.getIndex(): ");
sb.append(vault.getIndex());
catch (Exception ex)
sb.append("\nException: ");
sb.append(ex.getMessage());
return sb.toString();
%>
<form>
<INPUT TYPE=BUTTON OnClick="javascript:top.one()" VALUE="1">
<INPUT TYPE=BUTTON OnClick="javascript:top.two()" VALUE="2">
<INPUT TYPE=BUTTON OnClick="javascript:top.three()" VALUE="3">
</form>
<%
String action = request.getParameter("Action");
String js = handleAction(action);
System.out.println(js);
%>
<%= js %>
</BODY>
</HTML>

This is not an EJB problem as I thought, as I can duplicate it with a
normal Java class called from JSP page; in fact its an IE special
feature. It works fine under Netscape, and only shows the offending
behaviour under IE (thank you again Micros**t). So its back to
Netscape as standard for me!
John

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