I can move the cursor to the right side of the piture, with the mouse, and scroll up and/or down. Lately, however, the picture will, sometimes, move up or down, even when I'm not scrolling. Sometimes it will do that, even when the cursor is nowhere near the little thing that moves up and down, when you scroll. It's even done it when I'm not even touching the mouse. (It's just sitting there.)
I don't know if this mouse is called wireless, or cordless. (It's not attached to anything, and has a couple of batteries in it.) I think it is also called "optical". (It has no ball on the bottom but, instead, a little light.) There is also, on the bottom, a little tiny button marked, "Reset". Would it help to try pushing it?
Thanks for any help.