Question: How can I set a "spacer" div to fill remaining height space between CONTENT and FOOTER, so footer will be always at the bottom of the page (not window as originally asked)? 
Here is a example where footer is not at the window's bottom: <http://template1.staceyapp.com/> (I'm using this template, so structure is the same).
I've tried many things like creating a div and setting it to be min-height, height 100% etc. 
Probably Javascript is needed for that. 
Are you able to help me setting jQuery to calculate it's height to fill the remaining space?
Is there a better solution?

Many thanks in advance,
Graxa

Answer: 
You can use CSS to position the footer at the bottom of the page.

by using `position: fixed` or if the footer is contained within another div (container)
set the `position` of that to `relative` and the `position` of your footer to `absolute` and then specify `bottom: 0;` for your footer to keep it locked to the bottom of the page.
Have you tried to set the footer just to position:fixed on the bottom?