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[eluser]Jay Turley[/eluser]
Responding to Michael's post about applying unobtrusive javascript, I have to second his opinion of new windows, though I've mellowed in my old age.

The jQuery library [1] will allow you to do what you want with ease.

Then, you can use the jQmodal plugin [2] to do that neat "modal window" effect instead of opening a new window.

Finally, I know there are several plugins for jQuery [3] which will handle tooltips for you as well.

No sense trying to reinvent the wheel!

[1] http://www.jquery.com
[2] http://dev.iceburg.net/jquery/jqModal/
[3] http://www.google.com/search?q=tooltip+plugin+jquery