[jQuery] Periodical updater using Json in Jquery?

I'm grabbing an update from a json file, but I want to have it update perodically to the screen, overwriting what it found before... sort of like Prototype's Ajax Updater. Is this possible in Jquery? I scoured the groups to but only found a digg spy thing, which is sort of what I'm looking for

[jQuery] Periodical Updater

HI, I tried to implement some code that do the same as Ajax.periodicalUpdater in Prototype, when I run it in the browser, it works, but the memory used by the browser getting bigger and bigger, so the browser will not respond anymore, Here is my code script type=text/javascript