Page Header ?changeprefs.php=$css

[96turnerri]

hi im using this code i found on here from pyro to change a stysheelt


<?PHP

$loc = $_SERVER["HTTP_REFERER"];
$css = $_GET["file"];

setcookie("stylesheets",$css,time()+31536000); #one year
header ("Location:$loc?changeprefs=$css");

?>


header was header ("Location:$loc");

but i modifyied it so that it should be if black style sheet is selected via link on index.php htp://domain.com.index?changeprefs=Black and it is however if i now choose green

htp://domain.com/index.php?changeprefs=Green?changeprefs=Black

obviously i would like the first to not be displayed only the last or latest, one more thing (sorry) if i type in address bar

htp://domain.com/index.php?changeprefs=Green

only the last one i chose on page ie whats it the cookie is displayed

any ideas?