Change the values in this line to suit
var docheight=(window.innerHeight)? window.innerHeight-18 : htmltooltip.iebody.clientHeight-15;
Instead of -18 and -15 try +18 and +15 and see what you get. Adjust further if necessary.
Quizmaster: This city in anagram form GIN JIBE has hosted the Summer Olympics. What is it?
All the code given in this post has been tested and is intended to address the question asked.
Unless stated otherwise it is not just a demonstration.