Vytvoril som login s unexpected T_STRING*

<?php

$username = $_POST['username'];
$password = $_POST['password'];

if ($username&&$password)
(

$connect = mysql_connect("mysql.ic.cz","tym_startregistrace") or die("Nejde prihlásiť server padol...");
mysql_select_db("tym_startregistrace") or die("STOP !");

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

$numrows = mysql_num_rows("$query");

if ($numrows!=0)
{

    while ($row = mysql_fetch_assoc($query))
	 {
	       $dbusername = $row['username'];
		   $dbpassword = $row['password'];
	 }

    if ($username==$dbpassword&&$password==$dbpassword)
	 {
	   echo "Vitajte , ste prihláseny !"; 
	 }
        else
		   echo "Špatne heslo!";

}
else
  die ("Tento uživatel neexistuje!")

)
else
   die("Zadajte meno a heslo!");

?>