Home Tips and Instructions Joomla! Tips and Instructions Redirecting 404 Error Pages to index.php in Joomla!
Redirecting 404 Error Pages to index.php in Joomla! PDF Print E-mail
Edit templates/system/error.php to add the following line after line 19 in the file (just before the close of the <head> tag)
Code:
<meta HTTP-EQUIV="REFRESH" content="0; url=/">