Ben, I would say that the only reason
$select_sql_two = mysql_query($select_sql);
if($select_sql_two) {
would refuse to execute is if $select_sql represents an invalid SQL
statement. Whether it has records or not, you should (if I'm not very
much mistaken) get a resource returned in select_sql_two, which will
make your IF succeed.
You should probably check out http://php.net/mysql_query for more
information on this function. The difference between "empty result" and
"invalid query" is significant. Once you've determined that the query
is valid, you must also then check to see if it returned any rows,
possibly using a function like mysql_num_rows.
Hope that helps!
-P
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