autopostback and the back button

hi all, i was wondering for somebody could help me out...so i'm using a dropdownlist, checkboxlist, with autopostback = true...i'm populating the boxlist with data against a ms sql server...the problem i'm having is that when i select a new item in the dropdown or checkbox, it post a new page with the updated changes to the dropdown/checkbox...so when i click the "back button" on the browser it would simply take me back to the previous dropdown item and not the previous page...so i do i get around this problem...if anybody can give me some suggestions, it will definitely make my day...thanks