get lang from $_GET

function getURL( $lang ) {
   $i = 1;
   $url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['SCRIPT_NAME']."?";
   while( list( $key, $value ) = each( $_GET )) {
      if( $key != "lang" ) {
         $url .= $key;
         if( $value != "" ) {
            $url .= "=$value";
         }
         if( $i < count( $_GET )) {
            $url .= "&";
            $i++;
         }
      } else {
         $amp = 1;
      }
   }
   if(( @$amp != 1 ) && ( count( $_GET ) != 0 )) {
      $url .= "&";
   }

   $url .= "lang=$lang";
   reset( $_GET );
   return $url;
}
if( isset( $_GET['lang'] )) {
   $lang = $_GET['lang'];
   $paramLang = "&lang=$lang";
} else {
   if( ereg( "(sk|cs|pl)", substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2)) || $lang['lang'] == 'sk' ) {
      $lang = "sk";
   }
   else {
      header("Location: ".getURL( "en" ));
   }
}