1. you did not close the div for the header background image.
<div style="height: 140px;"> <!--dobavil dlja shapki foruma-->
this should have a closing </div>
2.. you have specified 140pixel height for your background image but the image is actually 200 pixels high.
you should change height: 140px to height: 190px
3. not sure how this is working, but you have the background image for the header set to a different file name that what is actually showing.
the header background image is:
http://www.hondaforum.lv/styles/prosilv ... pka_v4.png
in your colours.css file, you show this for the background image:
so, basically , you need to clean it up. go back to the instructions you followed to make the changes and check all your edits.