problem with css on IE! Please Help Me!

Helllo, i am using Zen Cart " 1.3.7.1" and i want to modify a template from templatemonster.

Actually i want to keep the layout and to change images and backgrounds but i encounter a bug for sideboxes headers in IE 7 - it dosn't shows the right corners!

:( Everithing works fine on FF but on IE not.

I think there is something from css but i'm not sure since i am a beginner!

I have just posted some images with the differences, Please help me!

No one here can help with a Template Monster template question without a link to the actual site.

Ok the problem was solved with a little help from a designer! Thanks for replyes!