You have at your disposal a jQuery script to display modal windows like the one you are reading.
The implementation is simple :
write the link :
<a class="gypoplight" href="#?w=560&rel=popup1&btn=Close&msk=msk=skins/skin5_guppy2015/">The link text</a>
w=500 indicates the width of the window rel=popup1 popup1 is the name of the id of the div container btn=Close contains the text of the tooltips button closure msk=msk=skins/skin5_02/ indicates the skin directory for the button image
write the content in a layer with the appropriate classes :
<div class="gypopup_block" id="popup1"> .... The content to display ... </div>
You can include any type of content, text and images.