Blur image under while scrolling it

Blur image under while scrolling it

I'm using blurjs http://blurjs.com, which seems to be the only possible
solution to make gaussian blur effect for the image that need to be
scrolled.
I got a stuck with stupid problem: I need to have left panel fixed, and
while scrolling the image it appears blurred under that panel (the panel
acts as a "frosted glass")
for the moment you may see that it's not working properly...
you can try to move left sidebar by dragging it with a mouse but the idea
is to make it static
you may see here what i'm talking about: http://fastweb.yomu.ru/test
WARNING! 14MB PNG!
I hope I just need to change something in js:
$('.circle').blurjs({
draggable: true,
overlay: 'rgba(255,255,255,0.1)',
radius:10
});