PHP parser error

I don't understand why does it display this message: "Parse error: parse error in C:\wamp\www\aaa\tftp scripts\testTFTP_r3.php on line 45"

each time I tried to execute the php scripts as below:

<?
//telnet

require_once "PHPTelnet_config.php";


$telnet = new PHPTelnet();

$result = $telnet->Connect('192.168.100.30','','');

if ($result == 0) { 
    //echo $username1;
    $telnet->DoCommand($username1, $result);
    // NOTE: $result may contain newlines
    //echo $result;
    $telnet->DoCommand($password1, $result);
    // NOTE: $result may contain newlines
    //echo $result;
    // say Disconnect(0); to break the connection without explicitly logging out
    //$telnet->Disconnect(); 
    $telnet->DoCommand("super", $result);
    $telnet->DoCommand("super", $result);
    $telnet->DoCommand("enable", $result);
    $telnet->DoCommand("cisco", $result);
    $telnet->DoCommand("copy tftp startup-config", $result);
    $telnet->DoCommand("192.168.100.99", $result);
    }
    //here is the command to specify which lab

    switch(3){
        case 1:
            $telnet->DoCommand("R3_lab1_Config", $result);
            break;

        case 2:
            $telnet->DoCommand("R3_lab2_Config_PPP", $result);
            break;

        case 3:
            $telnet->DoCommand("R3_lab3_Config_SSH_NTP_Syslog", $result);
            break;
        default :
            echo "something went wrong with the selections" ;
            break;
    }
?>

Please assist. Thank you in advance