Online Voting require script to disable

Hey everyone,

Hope you can help me out here. I have designed .asp pages for an online vote.

Everything works fine except one little problem, On my last page - confirmation page - I need to either disable the BACK button or on the page were they submit their vote it has to stay on the same page...because the way it is now once they submit their vote and it enters in the access database...and it brings them to their confirmation page...if they use the back button just once and click submit again it will again register their vote in the access database. I can't have them vote more than once.

So any thoughts on how to solve this?

Thanks much appreciate the help.