Thank you!
If someone is wondering I used the following code:
<?php
$menunum = false;
$rslt = mysql_query('SELECT menu FROM '.TABLE_PREFIX.'pages WHERE page_id = \''.PAGE_ID.'\'');
if(mysql_num_rows($rslt)>0){
while($row = mysql_fetch_array($rslt)){
$menunum = $row['menu'] ;
}
}
?>