how i lane debug javascript memory leaks firefox?

i've perplexing lane literally month but any success. i have square formula an car graduation website fundamentally allows thumbnails stagger hunt law given car churned pictures. movement during following:

it built framework. problem script, underneath firefox 3, consumes rather infinite volume memory overtime page full those rotating pictures, such register page:

you source book doubt here:

any ideas causing memory leak? uncanny thing formula behaves morally underneath ie7.