Parse error @ header template when adding my own php-code!

Hello!
Im currently running wp 1.5 and the classic theme. Now, in the header i wanna insert the following script;

<?php
 
if(!isset($_COOKIE[“din_kana”])) {
  echo ‘<img src=”images/new.jpg”>’;
  setcookie(“din_kana”, TRUE, time()+3600);
} else {
  echo ‘<img src=”images/visited.jpg”>’;
}
 
?>

As you may understand, i want to show the users one image first time they enter, and then show’em another later. But all i get is:

Parse error: parse error, unexpected T_IF in /customers/gosse.se/gosse.se/httpd.www/artikel/wp-content/themes/classic/header.php on line 29

Can anybody help out please?

Thanks
mårten, sweden