[StepFenz]

Solved it! Don't ask me how, but it works. In order to improve the interaction on this thread ;-) : I also added the total number of pictures of my photopost-section. Here it is (note that my photopost prefix is pp, if yours is different change that in the query below, eg. you have xx as photopost prefix, change ppphotos into xxphotos):

find:
mysql_free_result($threada);

after that add:

//get total photos
$queryd="SELECT COUNT(*) AS ppphotos FROM ppphotos";
$ppphotosa = mysql_query_eval($queryd,$link);
$ppphotosb = mysql_fetch_array($ppphotosa);
$totalphotos=number_format($ppphotosb['ppphotos']);
mysql_free_result($ppphotosa);

And replace:
$text = "Members: $numbermembers\nThreads: $totalthreads\nPosts: $totalposts\n";

Into:
$text = "Members: $numbermembers\nThreads: $totalthreads\nPosts: $totalposts\nPhoto's: $totalphotos\n";

I like this, because I now have immediately information on my frontpage about the status of all content, including photos.