Can't setup custom error pages

[Joeri007]

I have created 4 different error pages:
wwww.sunenco.be/errorpage404.html
www.sunenco.be/errorpage400.html
www.sunenco.be/errorpage403.html
www.sunenco.be/errorpage500.html

I have made a .htaccess file like this:
ErrorDocument 400/errorpage400.html
ErrorDocument 403/errorpage403.html
ErrorDocument 404/errorpage404.html
ErrorDocument 500/errorpage500.html

Why don't these pages show up when you use a non existing URL for instance.
I followed all the details explained in the following thread:

http://www.vodahost.com/vodatalk/bluevoda-tips-tricks-shortcuts/33222-make-more-functional-404-error-page.html

Can anyone tell where i'm going wrong,all I get when I mistype a URL is this:
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@sunenco.be and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

[CarbonTerry]

Re: Can't setup custom error pages

Looking at your htaccess file I believe that you need an additional space.
ErrorDocument 500/errorpage500.html
ErrorDocument 500 /errorpage500.html