encryption

[Anon]

Can anyone help me using the crypt() function:

The password is encrypted in the database but when i go to login it says that the password is invalid

Here is my login code:
#!/usr/local/bin/php
<?php
// display individual record

if ((!$username) || (!$password)) {
echo "All fields were not completed";
exit;
}
elseif (($username)&&($password)) {
$db = mysql_connect("localhost", "ohbs", "X4aGnwSw");

mysql_select_db("ohbs",$db);

$result=mysql_query("SELECT * FROM customers WHERE username='$username'",$db);

        $my_row = mysql_fetch_array($result);
        $email = $my_row["email"];

$salt=(strlen($email));
$encpass=crypt($password, $salt);

$result1 = mysql_query("SELECT * FROM customers WHERE username='$username' AND password='$encpass'",$db);

$num=mysql_numrows($result1);

$myrow = mysql_fetch_array($result1);

if ($num!=0)
{

header("Location: http://www.redbrick.dcu.ie/~ohbs/front.html");
exit;

}

elseif ($num==0)
{

echo "Sorry, no records were found! Please go back to previous page and click on register.\n<br>";
echo"<a href='test7.html'>Back to logon page</a>";
}
}

?>

Here is my registering code:

#!/usr/local/bin/php

<?php

if ((!$username) || (!$password) || (!$email) || (!$first) || (!$last)||
(!$age)||(!$address) || (!$phone)) {
echo "All fields were not completed";
exit;
}
if((!ereg("[a-z]", $first)) || (!ereg("[a-z]", $last)))
{
echo "First and Last name not entered correctly";
exit;
}

   if (!ereg("^[[:alpha:]]{4,8}$", $username) || !ereg("^[[:alpha:]]{4,10}$", $password)) 
   {
   echo " Username has to be between 4 and 8 chars and password has to be between 4 and 10";
   exit;
   }

	if (!ereg('^[-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+'.

'@'.

'[-!#$%&\'*+\/0-9=?A-Z^{_`a-z{|}~]+.'.}

'[-!#$%&\'*+\./0-9=?A-Z^{_`a-z{|}~]+$',} $email))
{

echo "Invalid email address";
exit;
}

else
{
// process form

$db = mysql_connect("localhost", "ohbs", "X4aGnwSw");
mysql_select_db("ohbs",$db);

$salt=(strlen($email));
$encpass=crypt($password, $salt);

$sql = "INSERT INTO customers
(username,password,email,first,last,age,address,phone) VALUES
('$username','$encpass','$email','$first','$last','$age','$address','$phone')";

$result = mysql_query($sql);
echo "Thank you! Information entered.\n<br>";
echo"<a href='front.html'>Proceed to DCU Online Holiday Booking System.</a>";
}

?>