Redirect 404 page in Joomla to cutom pages : 404 redirection is very common problem with joomla . 404 errors are also very bad for SEO (search engine optimization). The very basic solution to fix this out is
1) Copy the file templates/system/error.php to your default template location templates/<template-name>/error.php using either your hosts file manager or with a FTP client such as FileZilla.
2) Open error.php for edit
Change this original code near the top of the file
// no direct access defined( '_JEXEC' ) or die( 'Restricted access' ); ?>
To this (add the stuff in red). Don’t forget to change <your-url> to your web site name!
// no direct access
defined( '_JEXEC' ) or die( 'Restricted access' );
if (($this->error->code) == '404') {
echo file_get_contents('http://www..com');
} else {
?>
Finally at the very bottom of the file add the following
cheers
