Let’s use the loops’ power, read this article, and put this in pratice:
"The alternative code (ended by <//Bn>) is displayed instead of the loop, thus replacing the optional “before” and “after” codes, if the loop doesn’t return any results at all."
This should be used on the article page as:
<B_principale>
<BOUCLE_principale(ARTICLES){id_article}>
blah, blah, blah
</BOUCLE_principale>
<INCLURE(unknown.php3)>
<//B_principale>Next, create the couple unknown.php3 unknown.html.
For the page unknown .html you can offer text and a redirection to the home page or the site map, for example.
Or an automatic redirection.
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