simple scroll bar plugin?

simple scroll bar plugin?

I am looking for a simple scroll bar plugin that works by itself -- i.e., that doesn't scroll anything. I need a plugin that can call functions when the user clicks (or continues to hold down on after a delay) an arrow key or moves the slider, and that has a function allowing setting of the slider at a particular location. Essentially, I'm looking for something like the slider from jquery UI but with arrows too. It should look nice. (If there isn't anything, I'd be willing to pay someone $50 to extend the slider plugin so that it supports arrows and looks like a regular scrollbar, if anyone's interested.)

I wondered whether there was some way to do this by just leveraging a browser scroll bar, but didn't see any easy way to do this (maybe I'm missing it). I've seen jScrollPane, which is very nice and has options for realistic-looking scrollbars, but it scrolls a pane. I need to do my scrolling manually, because I am scrolling a large dataset and need to load the rows after each scroll change. I've also seen the terrific jqGrid, which has an ability to do an "infinite" scroll on a dataset, but cannot represent with the scroll bar where in the possible return values one is in the dataset and cannot skip over many records in scrolling. (For example, if I have a million records on the server, I want someone to be able to move the slider two-thirds of the way down, and present those records, without loading everything in between.)

Thanks so much in advance!