back button and CACHE

Hello,

	I am having a problem with cache using mozilla 7.2 . I am a java 
developer and I have a web site made with use of JSP and servlets. In 
this site I have a JSP page with a form, which sends data to a servlet 
by POST.
	The problem is: I enter on this page, post the data and the result is 
shown ok. If i enter and post data again, it shows again the right 
results. However, if I post the data, click on the back button, change 
the parameters which will be send by the form and submit again, it shows 
me the result of the last query, stored in cache.
	It is a serious problem, because it doesn´t happens on IE and my 
customer depends on this to approve use o linux/mozilla from users. I 
tried to change the way mozilla uses cache saying to it to not use any 
cache, I used the following meta tags to do this:
	<meta http-equiv="expires" content="0">
	<meta http-equiv="Cache-Control" content="no-cache">
	It doesn´t work, when I look at the page information, it shows me disk 
cache as origin.
	Any tip?
	Any help will be very welcome.

Thanks in advance,

Marcelo.