zorgi

hi please i need your help with some codes i have written they re working but i need efficiency pls if there re better ways or points i need to work on please show me :
function one_venue($time,$venue,$date,$code){
$qry="select * from timetable where time='$time' and date='$date' and venue='$venue'";
$rst=mysql_query($qry) or die (mysql_error());
if(mysql_num_rows($rst)>0){
$msg="An Event is holding in".$venue."at".$time.".! Please fix this event for another time or venue";
return $msg;
}
else{
one_class($time,$code,$date);
}
}
function one_class($time,$code,$date){
$qry="select * from timetable where time='$time' and date='$date' and code='$code'";
$rst=mysql_query($qry) or die (mysql_error());
if(mysql_num_rows($rst)>0){
$msg="An Event has been scheduled for this class at this time (".$time.")!. Please fix this event for another time";
}
else{
$msg="The event has been registered successfully!";
}
return $msg;
}

hey i know am breaking the rules here but i improved on my code and its giving error now(warning cannot modify header info ) please view my thread i ve posted the complete code there please this site is suppose to have start working two hours ago