Problem ...

Hi everyone,<br><br>I am having a dropdownlist which is populated from the database based on the value of the dropdownlist the value of checkboxlist changes, checkboxlist is also getting populated from the database, now after selecting the checkboxes when I submit the form is submitted to the next page, now when I click back button from the browser and even after changing the value of dropdownlist the number of boxes that where selected remains selected although the value of checkbox change, how can I get rid of this i.e. when someone clicks Back button and also changes the value of the dropdownlist the items that are displayed should not get checked, how can I do this.<br><br>Thanks in advance,<br>Uday.