Ahhhh. Just saw this question again, you've hit the "Have a Question or Comment" button on the left. This sends an email notification to the poster of that Question or Answer. When replying to a comment, you need to hit the [<-- Reply] button on the right-hand side of the comment.
Anyhow, here's a quick whip-together job that gives you a pop up that works like a tool-tip. You an chuck html into be displayed too.
Here's the one I made and an example of it's use. Obviously, you could add an attribute to the elements (perhaps mTitle) and set this to contain the tooltip's html for that element. Then you can set the contents of the popup window to reflect the value of mTitle.
I'm not sure, but perhaps you can add a style that will disable display of the standard tool-tip. If so, it would make your html cleaner and avoid any potential troubles with using custom attributes. I just read yesterday of old code that added an attribute 'translate' to elements. This used to be fine - 'recently' this attribute was added to the official spec - causing all sorts of trauma to the maintainer. poor sod!