$sses = $_SESSION['username'];

$sql = "SELECT `username``wavecoins` FROM `user` WHERE username = '$sses' AND wavecoins";
$result = mysql_query($sql);
$count = mysql_num_rows($result);
    if ($count == 1)
    {
    echo "Zu Wenig Guthaben";
    }
    else {

    echo "Genung Guthaben";

}