can any one find an error php code?

[Taylor]

<?php
session_start();

$mysql_host = "******";
$mysql_database = "******";
$mysql_user = "******";
$mysql_password = "*****";
$username = $_POST["username"];
$password = $_POST["password"];

if ($username&&$password);
{
$connect = mysql_connect($mysql_host,$mysql_user,$m… or die("Could not connect please check your internet connection");

mysql_select_db($mysql_database) or die("DB error");

$query = mysql_query("SELECT * FROM accounts WHERE username='$username'");

$numrows = mysql_num_rows($query);

if ($numrows!=0)
{
while ($row = mysql_fetch_assoc ($query))
{
$dbusername = $row['username'];
$dbpassword = $row['password'];
$dbid = $row['id'];
$dbip = $row['ip'];
$dbemail = $row['email'];
$dbfirstname = $row['firstname'];
$dblastname = $row['lastname'];
}

if ($dbusername==$username&&$dbpassword==$p…
{
echo "worked";
}
else
echo "Username or password not valid";




}
else
die("Username or password not valid");
}
else
die("please enter username and password");


?>



i get error

Parse error: syntax error, unexpected T_ELSE in /home/a3059601/public_html/login.php on line 45
any one see anything wrong?