"Copied!" tooltip misplaced when you scroll

[kosarko]

so the position of the tooltip is set to fixed (because absolute was broken in repo, maybe should have fixed repo instead...), it's css top + left is set based on the .offset() of the button you press; I'm guessing the offset takes into the account the amount you've scrolled and then the fixed tooltip is rendered way below or even outside the current visible window; is there a property that'd give me position of an element in the current view/window? Or maybe I can base it on mouse position when user clicks (would that work on touchscreens?) or maybe I can subtract the amount scrolled...
(note that lindat-common is on purpose without bootstrap, so I can't use bootstrap's tooltips)...