PHP Problem: Check ind/Check ud.

<?php

$result = mysql_query("SELECT * FROM stamps WHERE date = '$day/$month/$year' and username = '$username' ORDER BY id DESC LIMIT 1") or die(mysql_error());       
       
if (mysql_result($result,0)) {   
           
echo("Du er allerede checket ind");                   

} else {
           
mysql_query("INSERT INTO stamps (id, username, date, week, checkin, checkout, comments) VALUES ('', '$username', '$day/$month/$year', '$week', '$time', '', '')") or die(mysql_error());
           
echo "Du er nu checket ind";       

}

?>