PHP - Insert Data From A Form Into Table

CREATE TABLE IF NOT EXISTS `contacts` (
`contact_id` int(10) NOT NULL AUTO_INCREMENT,
`firstname` varchar(255) NOT NULL,
`lastname` varchar(255) NOT NULL,
`company` varchar(255) NOT NULL,
`cell_no` text NOT NULL,
PRIMARY KEY (`contact_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=8 ;

CREATE TABLE IF NOT EXISTS `users` (
`user_id` int(11) NOT NULL AUTO_INCREMENT,
`users_name` varchar(30) NOT NULL,
`uname` varchar(30) NOT NULL,
`u_pass` varchar(60) NOT NULL,
`utype` varchar(30) NOT NULL,
`timezone` varchar(30) NOT NULL,
`uapi_user` varchar(30) NOT NULL,
`uapi_pass` varchar(60) NOT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=20 ;

<?php
if (isset($_POST['submit'])){
    //form has been submitted1
    $firstname  = trim($_POST['firstname']);
    $lastname   = trim($_POST['lastname']);
    $company    = trim($_POST['company']);
    $cellno = trim($_POST['cell_no']);

    if($firstname == ''){
        echo '<div class="alert alert-danger">First Name is not Valid!</div>';
        exit;
    }elseif($lastname == ''){   
        echo '<div class="alert alert-danger">Last Name is not Valid!</div>';
        exit;
    }elseif($company == ''){    
        echo '<div class="alert alert-danger">Company is not Valid!</div>';
        exit;
    }elseif($cellno == ''){ 
        echo '<div class="alert alert-danger">Cellphone Number is not Valid!</div>';
        exit;

    }else{

        $query = "Select cell_no from contacts where cell_no = '".$cellno."' ";
        $result = mysql_query($query);
        if (!mysql_num_rows($result)) {

        $sql = "INSERT INTO contacts(firstname, lastname, company, cell_no)
                            values('{$firstname}','{$lastname}', '{$company}', '{$cellno}')";
        $result = mysql_query($sql);
        confirm_query($result);

        //echo '<div class="alert alert-success">Successfully added.</div>';
        //exit;
        ?>
                    <script type="text/javascript">
            window.location = "contact_list.php";
        </script>
    <?php
    }
    else{

        echo '<div class="alert alert-danger">Username. already exist!.</div>';
        echo '<p><a href="new_contact.php" class="btn btn-success"> Back </a></p>';
        exit;

    }}

}else{
    $firstname  = "";
    $lastname   = "";
    $company    = "";
    $cellno = "";
}

?>

<?php

include_once('class/class_email.php');

// contact to database
$connect = mysql_connect("localhost", "admin", "password") or die ("Error , check your server connection.");

mysql_select_db("database");

$fname = $_POST['fname'];
$lname = $_POST['lname'];
$email = $_POST['email'];
$company = $_POST['company'];
$telephone = $_POST['telephone'];
$comments = $_POST['comments'];
$EID = $_POST['eid'];
extract ($_POST);

// Pick up the form data and assign it to variables
// 
$id = intval($id);
$fname = strip_tags($fname);
$lname = strip_tags($lname);
$email = strip_tags($email);
$company = strip_tags($company);
$telephone = intval($telephone); 


$query="INSERT INTO users(`id`, `fname`, `lname`, `email`,`company`,`telephone`) VALUES('$id','$fname','$lname','$email','$company','$telephone')";

echo $query;

mysql_query($query)  or die(mysql_error());
echo mysql_error();

$SQL_GetEquipment = "SELECT * FROM `new_equip` WHERE `id`='$EID' LIMIT 1;";
$result = mysqli_query($connect,$SQL_GetEquipment);
$row = mysqli_fetch_assoc($result);
$EmailBody = "$fname $lname has requested a quote from NAPE on Item $EID\n 

Information on quote request: \n
Name: $fname $lname \n
Email: $email \n
Company: $company \n
Number: $telephone  \n 
Comments: $comments  \n 
\n
Information Requested for: {$row['itemname']}\n
The URL to {$row['itemname']} is: http://www.mydomain.com.com/new-product.php?Item=$EID
\n
Click to send a quote now:\n
http://www.mydomain.com.com/Admin/send-quote.php?id=$EID ";

$e = new email();

//First value is the URL of your server, the second the port number
$e->set_server( 'mail.mydomain.com.com', 26);

//First value is your username, then your password
$e->set_auth('noreply@mydomain.com', '112233');

//Set the "From" setting for your e-mail. The Name will be base64 encoded
$e->set_sender( 'Quote Requested', 'noreply@mydomain.com' );

//for one recipient
//$send_to = array('myemail@mydomain.com','myemail2@mydomain.com');
$send_to = ('myemail@gmail.com');
//you may also specify multiple recipients by creating an array like this:
//$send_to = array('foo1@localhost.local', 'foo2@localhost.local', 'foo3@localhost.local');


$subject = 'Quote Request from NAPE';
$body = "$EmailBody";
if( $e->mail($send_to, $subject, $body, $headers) == true )
{
  //message was received by the smtp server
  //['last'] tends to contain the queue id so I like to save that string in the database
  echo 'last: '.htmlspecialchars($e->srv_ret['last']).'';
}else{
  //something went wrong
  echo 'all: '.nl2br(htmlspecialchars($e->srv_ret['all'])).'';
  echo 'full:'.nl2br(htmlspecialchars($e->srv_ret['full'])).'';
}

?>