[TYPO3-english] Click pop-up extension?

[Eric from Panetiere Marketing]

Hello:
I am new to Typo3. we took over hosting of a T3 site. Have it all up and 
going and now need to extend it out.
We need to add  Click pop-ups to some pages: hidden divs that become 
visible when a link on the page is clicked.
It will be for text.

It looks as if there will be an extension to do that.
Can anyone advise us?

Thanks much, Eric