slickgrid

I need to present a large number of rows of data (ie. millions of rows) to the user in a grid using JavaScript. The user shouldn't see pages or view only finite amounts of data at a time. Rather, it should appear that all of the data are available. Instead of downloading the data all at once, small chunks are downloaded as the user comes to them (ie. by scrolling through the grid). The rows will not be edited through this front end, so read-only grids are acceptable. What data grids, written in JavaScript, exist for this kind of seamless paging? Tin ( Disclaimer: I am the author of SlickGrid )