Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/doreen/public_html/trunk/template/posts.php on line 19

I don't know how to fix it

You have a problem with your MySQL query. To indentify the problem, use mysql_error() e.g.

mysql_query("some select statement here") or die("QUERY ERROR: ".mysql_error())

Tell us which error you see after this?

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