Use https when necessary

main/document/edit_paint.php

@@ -214,7 +214,8 @@ $_SESSION['temp_realpath_image']=$to;
 //load image to url
 $to_url=api_get_path(WEB_ARCHIVE_PATH).'temp/images/'.$file_crip;
 $image=urlencode($to_url);
-$pixlr_url = 'http://pixlr.com/editor/?title='.$title.'&image='.$image.'&loc='.$loc.'&referrer='.$referrer.'&target='.$target.'&exit='.$exit_path.'&locktarget='.$locktarget.'&locktitle='.$locktitle.'&credentials='.$credentials;
+$pixlr_protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') ? 'https' : 'http';
+$pixlr_url = $pixlr_protocol.'://pixlr.com/editor/?title='.$title.'&image='.$image.'&loc='.$loc.'&referrer='.$referrer.'&target='.$target.'&exit='.$exit_path.'&locktarget='.$locktarget.'&locktitle='.$locktitle.'&credentials='.$credentials;
  
 //make frame an send image
 ?>