htaccess file not working properly

[rugrotts]

I can not get the image to show on my 404 page. It is the same as one i use on another website and the coding is the same on both. I am too scared to try to change the htaccess file as I dont know much about it.
This is the content of my htaccess file:

IndexIgnore .htaccess */.??* *~ *# */HEADER* */README* */_vti*
<Limit GET POST>
order deny,allow
deny from all
allow from all
</Limit>
<Limit PUT DELETE>
order deny,allow
deny from all
</Limit>
AuthName example.com
ErrorDocument 404 /404.shtml

this is what hapens see it here: - Removed -
But when I go direct to the shtml page it is ok: - Removed -

Can someone tell me what is possibly missing from the htaccees file.
Thanks

 

[Infopro]

The image and background image both work on both pages for me. Links removed.