Importing MD5+Salt Passwords to MD5 – Oscommerce

I’m moving my site from an oscommerce store to a commercial application.

The new application stores its passwords using straight MD5 encryption. Oscommerce stores the password using MD5, but also adds a random 2 digit number (provided in plaintext) to the hash.

Here is what someone posted on a forum:

The two characters added are for creating the hash in such way that
hash=md5(twocharactersPlainPassword)
ie: 2letters: 74
Plain Password: PaSs
hash=md5(’74PaSs’)=acaa6e689ae0008285320e6617ca8e95:74

Here is the code how Oscommerce encrypts the password:

// This function makes a new password from a plaintext password.
function tep_encrypt_password($plain) {
  $password = '';

  for ($i=0; $i<10; $i++) {
    $password .= tep_rand();
  }

  $salt = substr(md5($password), 0, 2);
  $password = md5($salt . $plain) . ':' . $salt;

  return $password;
}

// This funstion validates a plain text password with an encrypted password
function tep_validate_password($plain, $encrypted) {
  if (tep_not_null($plain) && tep_not_null($encrypted)) {
    // split apart the hash / salt
    $stack = explode(':', $encrypted);

    if (sizeof($stack) != 2) {
      return false;
    }

    if (md5($stack[1] . $plain) == $stack[0]) {
      return true;
    }
  }

  return false;
}

Here is how my new cart encrypts the password:

if ($admin_password_encrypt == 1) {
    $password_match = md5($password);
} else {
    $password_match = $password;
}

Is there any possible way of importing customer passwords from my oscommerce cart to my new cart.