QFC: auto-submit without advancing to next step?

hi all! i'm using QFC with smarty, works like a charme, but now i've got the problem that i need to do an autosubmit when a specific element is changed, the page should reloaded. how can i achieve this in an onclick-event? is there a way to bypass the validation in this case? another problem, is there a way to bypass validation when doing a back-action? right now i have to fill everything on the active page to step back, this shouldn't be the case, if i see i did a wrong option on the last page and this changes the active page, i shouldn't need to fill in everything right now... bye, stephan