@krollender: Please read the thread properly
It will be very difficult to change and make it sticky. We need to build a child theme and then work on customizing the structure with wrap and all. For this you can use tweaky. They will help you in customization http://bit.ly/YANvfZ
So, I just recommend you to add minimum height in the main wrapper. You can add the following css in “Custom CSS” box in your theme option. Increase or decrease the height as per our need.
#main { min-height: 300px; }
If you don’t like this then there is another option to make the footer stay at the bottom do matter how small or big the screen are:
#colophon {
bottom: 0;
position: fixed;
width: 100%;
z-index: 9999;
}