You cant disable the back buuton, however you can prevent the user from going back to that page. what happens is it skips that page and goes to the previous one.
The location object's replace() method overwrites the current history entry with the specified URL. It removes the current history entry before the next URL is loaded. Removing the item from the history list also prevents users from seeing the page again by clicking on the Back button later.
This technique is very useful for online games and multi-page forms, where you want prevent the user from returning to the previous page. Furthermore, the location.replace() method is supported by all browsers except Navigator 2.0x. The following example shows how to use this method in a link:
<A HREF="javascript:location.replace('nextpage.html')">Advance</A>
or this which is part of a
java println statement and replaces the frameset with a page.
<input type='button' value ='Go To Checkout' onClick=\"parent.location='http://javaguy.yi.org/examples/LastChance.jsp?name=" + name + "'\">