I'm trying to create an approve button that I can put on a list view where multiple records can be selected to be approved or rejected.

I was going to create two seperate buttons for this.  One for Approve Selected and another Reject Selected.

The button, I believe, needs to call a VF page that invokes a class.  Has anyone done this or have any insight?

I've only done java buttons that have actions before and I'm stuck on how to get started.  I've done VF and classes but not sure how to call an approval process.