How about putting something like this in your layout:
<?php
if (!isset($description))
{
$description = preg_replace ("@</?[^>]*>*@", "", $content_for_layout);
$description = preg_replace('/\s\s+/', ' ', $description);
$description = substr($description, 0, 400);
}
?>
<meta name="description" content = "<?php echo $description ?>" />
Therefore if the varaible $description isn't set, just use the first x
characters of your page content.
HTH,
AD7six
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