Using custom error pages in Joomla is fairly simple.
First you should create your custom error pages - you can use a text/HTML editor of your choice (for example Dreamweaver). Once you are ready with the pages, upload them into a subdirectory of your public_html callederrors. Then open your main .htaccess file and add the following lines in it:
# serve custom error pages
ErrorDocument 400 /errors/400.html
ErrorDocument 401 /errors/401.html
ErrorDocument 403 /errors/403.html
ErrorDocument 404 /errors/404.html
ErrorDocument 500 /errors/500.html
NB: To avoid your custom error pages from being ignored by Internet Explorer, ensure that they are larger than 512 bytes in size.
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