How can I add an on(rollOver) event to a dynamic hyperlink?

I have hyperlinks dynamically placed on a nav from an xml file where both link names and urls are extracted from.
I would love to add a rollover Effect so I can have some text pop up when a hyperlink is rolled over. Since it is a dynamic text box, the on rollover functions are grayed out.
I tried placing a movieclip over the link but of course now the hyperlink is covered up.

Is there another way?

Thanks in advance.