Visit this link, see if it's something you can handle

and maybe you can use it to achieve what you want!
http://www.dynamicdrive.com/dynamici...dhtmlmodal.htm
So basically it can contain your survey dependent upon how you code it
Also depending upon your version if your on 3.6.8.... not sure if it is out yet for 3.7.3 BUT there is a content management system mod i.e. Webtemplates etc that let's you create your own custom pages, you could just your survey code there OR include the script from DD in the page etc.
Webtemplates mod located here (3.6.8) -->
https://vborg.vbsupport.ru/showthread.php?t=103076
Edit: And yes, out for 3.7 -->
https://vborg.vbsupport.ru/showthread.php?t=186644
Let us know when you get it working and provide a link?!
S-MAN