udisystem on "[Plugin: Digg Digg] make the position fixed for social sharing buttons in digg digg"

can anyone help me..

I am using digg digg plug-in and it is working fine for me.
I am using the floating display.
When I go inside of any posts,the social sharing butttons are displaying.
here the the buttons are not fixed to one position.I need to fix the buttons to one position when I drag down to veiw the the contents of the posts.

Please help me to do this one..

Thanks in advance.

http://wordpress.org/extend/plugins/digg-digg/