I've been going through some bad links in Google webmaster tools... and I've discovered my DH error pages load weird sometimes. The graphics in my header only load correctly if the broken link happens to point toward the root directory. When it is looking into folders though, it doesn't work.
How can I fix this? For example, this link will load text from the header, but no graphics:
http://www.nrsmart.com/nothing/garbage/trash/blablabla (this folder doesn't even exist... I tried disabling indexes in .htaccess, but it made no difference)
If I change it to this, it works fine: