Quickform container(true) problem and validation question

hello, i was trying to clear out the container values by doing a $pager->controller->container(true) in the _process method( i believe it's _process, i don't have the code in front of me, but it's the action) and it's after my last page.. after i clear it, i send it back to the first page of the form and go through the form again. through my testing, i found that all of the container was reset except the values that were set in the last page of the form. if i add in a check to see if the last page information from the container is empty in the while building the form in the first page, and clearing it if it's not empty, that fixes the problem, but seems as if the (true) is not acting as should function. i tried repeating the problem with the example code included with the quickform package and it does the same thing. second question, i was wondering if there is a way to do conditional verification. for example, i have two fields one select and one textbox, the textbox is a hidden element(via css and javascript) unless the select is on a particular option. sooo.. i can't figure out a way to make the textbox a required field if a particular option is selected, but not any other option is selected. thanks in advance, mike