freaky sidebar issue and editing header image

Hi guys,

my blog is at atomise.net

I am Using the Gespaa theme designed by Phu.

1 ) there’s this issue that keep buggy me. The sidebar is not at the side and it’s at the bottom despite all attempt to fix it. I read the forum already but those remedy does’nt help, e.g (http://wordpress.org/support/topic/65140)

Pls help me to fix my sidebar back. (if you need the code, i will put it online.

2)

In addition, if you see the big grey area, is there anyway i can replace the grey part with a image (i dun even know what’s the area, or the measurement there)

Here’s the stylesheet if you want,
http://atomise.net/wp-content/themes/gespaa_v2/style.css