Index: includes/theme.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/theme.inc,v
retrieving revision 1.418
diff -u -p -r1.418 theme.inc
--- includes/theme.inc	25 Mar 2008 14:10:01 -0000	1.418
+++ includes/theme.inc	25 Mar 2008 20:53:21 -0000
@@ -1151,7 +1151,7 @@ function theme_links($links, $attributes
  *   A string containing the image tag.
  */
 function theme_image($path, $alt = '', $title = '', $attributes = NULL, $getsize = TRUE) {
-  if (!$getsize || (is_file($path) && (list($width, $height, $type, $image_attributes) = @getimagesize($path)))) {
+  if (preg_match("/^(http|https|ftp):\/\//i", $path) || !$getsize || (is_file($path) && (list($width, $height, $type, $image_attributes) = @getimagesize($path)))) {
     $attributes = drupal_attributes($attributes);
     $url = (url($path) == $path) ? $path : (base_path() . $path);
     return '<img src="'. check_url($url) .'" alt="'. check_plain($alt) .'" title="'. check_plain($title) .'" '. (isset($image_attributes) ? $image_attributes : '') . $attributes .' />';