short answer is No. There is no direct way to disable the back button so that it is greyed-out and user cannot click on it. However, there are some tricks using javascript which might be able to give you the results you need,although they won't be as pretty. One I am currently working on involves using javascripts window.history function with a session variable and automatically logging off and redirecting to login page if user hits the back button. You can also do something as simple as:

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<script language="JavaScript">
<!--
  javascript:window.history.forward(1);
//-->
</script>

<script language="JavaScript"> <!-- javascript<b></b>:window.history.forward(1); //--> </script>

Put that script at the top of every page. If user hits back button it will send them forward again.

Originally Posted by tgreer

There is no way to disable the back button reliably. Every method, short of writing your own browser, can be easily disabled. This question has been asked millions of times, for years and years. The "back" button is integral to how browsers work, and is firmly a part of the user interface and the collective "user expectation". Trying to fight it is usually a sign of poor understanding of the web, a flawed application model , and/or bad design!

Users will press the "back" button. They will be irritated if it doesn't work. They will often simply close the browser completely if your application doesn't behave as they expect.