Lazy Load Tree View Web Implementation

Question

Hello,
I'm looking for a tree view web implementation. I'm using Grails 1.3.

The user has a need to navigate a data set > 80Mb. The data has a hierarchical nature, so a tree view seems natural. The ability to compare sub trees is also desirable. Loading the entire data set takes to long and will likely overload the browser. Is there a tree view that will render data on demand?

Thanks,
Steve