In need of PHP to JS collapsable array printing routine?

I'm wondering if anyone has a PHP debug-type routine that will take a PHP array and output it to the web page, but make all the dimensions of the array collapsable, ideally showing each sub-key (or index) as the name to click to expand it again. I'm dealing with some rather huge datasets in multi-dimensional hashes and printing them out with a beautified print_r() is just not cutting it anymore. I need to collapse them down to wrap my head around them. Some of them have 6 or more dimensions! I use jQuery for JS if that helps (in case your routine requires that too).