Please help to me to rectify the undefined offset error. Actually the data

[frozenartic]

<?php
$con=mysql_connect("localhost","root","");
$db=mysql_select_db("daksha_sis",$con);
?>

<?php
$cname=$_POST['cname'];
$tname=$_POST['tname'];
$lname=$_POST['lname'];
$email=$_POST['email'];
$mem1=$_POST['mem1'];
$mem2=$_POST['mem2'];
$mem3=$_POST['mem3'];
$event=$_POST['event'];
$event2=$_POST['event'];
$event3=$_POST['event'];
$eventcc= count($event);

for ($i=0; $i < $eventcc; $i++)

{
$j=$i+1;
$k=$i+2;

$sql="INSERT INTO student values(' ".$cname." ',' ".$tname." ',' ".$lname." ',' ".$email." ',' ".$mem1." ',' ".$mem2." ',' ".$mem3." ',' ".$event[$i]." ',' ".$event2[$j]." ',' ".$event3[$k]." ')";
    $qury=mysql_query($sql);

}

    if(!$qury)
        echo"Name already taken";
    else
    {

        echo"Registration Sucessfull..";


    }

?>
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