I Need Help With My Login.PHP page Help!?

[Efdffdf F]

So I Coded This

<?php

$username = $_POST['username'];
$password = $_POST['password'];
$login = $_GET('login');

setcookie("username","$username",time()+86400);

if ($login=='yes') {

$_con = mysql_connect("localhost","root","");

mysql_select_db("login");

$get = mysql_query("SELECT count(id) FROM login WHERE user='$username'and pass='$password'");


$result = mysql_result($get, 0);

if($result!=1) {
echo "Invalid Login.";
} else {
echo "login Successful. Welcome Back " . $_COOKIE['username'] . " sir/madam.";
$_SESSION['username'] = $username;

}




}




?>

But Then I get this error When i try logging in.

Fatal error: Function name must be a string in C:\wamp\www\login.php on line 5

What Should I Do? I really need help PLZ help