$sql="SELECT userId FROM eventmember WHERE eventid='$event_id';";`
$resultset = mysql_query($sql);
$row = mysql_fetch_array($resultset);
$sql="SELECT userId FROM eventmember WHERE $sql="SELECT userId FROM eventmember WHERE eventid='$event_id';";`
$resultset = mysql_query($sql);
$row = mysql_fetch_array($resultset);
$sql="SELECT userId FROM eventmember WHERE