diff --git a/includes/common.inc b/includes/common.inc
index 1e40cb2..c128d96 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -2198,23 +2198,13 @@ function url_is_external($path) {
 }
 
 /**
- * Returns a local path corresponding to a given URL, if possible.
- *
- * Finds the configuration directory matching the given URL, and compares it
- * to the current configuration directory. Returns a local file path if they
- * match, and FALSE if they don't.
- *
- * In a properly-configured multisite installation, this function helps answer
- * the question, "Could this URL match a file or path within my site?"
- *
- * Whether the URL does in fact resolve to this site, or at all, cannot be
- * determined within Drupal itself.  This is only a sanity check.
+ * Returns an absolute local path corresponding to a given URL, if possible.
  *
  * For example, when looking for image URLs within an HTML Mail body for
  * possible conversion to inline attachments, the following code might be used:
  * @code
  *   if ( !url_is_external($url)
- *     && ($path = url_to_path($url))
+ *     && ($path = url_to_realpath($url))
  *     && file_exists($path) ) {
  *     // Attach $path and replace $url.
  *     ...
@@ -2228,7 +2218,37 @@ function url_is_external($path) {
  *   FALSE if $url contains a host/port that does not match the current site,
  *   or else a local path such as "/path/to/drupal/node/34".
  *
- * @see conf_path()
+ * @see url_to_path()
+ */
+function url_to_realpath($url) {
+  $path = url_to_path($url);
+  if ($path) {
+    return realpath('./' . $path);
+  }
+  return FALSE;
+}
+
+/**
+ * Returns an local relative url corresponding to a given URL, if possible.
+ *
+ * Finds the configuration directory matching the given URL, and compares it
+ * to the current configuration directory. Returns a local relative url if they
+ * match, and FALSE if they don't.
+ *
+ * In a properly-configured multisite installation, this function helps answer
+ * the question, "Could this URL match a file or path within my site?"
+ *
+ * Whether the URL does in fact resolve to this site, or at all, cannot be
+ * determined within Drupal itself.  This is only a sanity check.
+ *
+ * @param $url
+ *   The internal path or external URL being linked to, such as "node/34" or
+ *   "http://example.com/foo".
+ * @return
+ *   FALSE if $url contains a host/port that does not match the current site,
+ *   or else a local url such as "node/34" or "foo".
+ *
+ * @see conf_path(), find_conf_path()
  */
 function url_to_path($url) {
   $local = &drupal_static(__FUNCTION__, array());
@@ -2249,7 +2269,7 @@ function url_to_path($url) {
     );
   }
   return $local[$path]
-    ? realpath('.' . $script_name) : FALSE;
+    ? substr($script_name,1) : FALSE;
 }
 
 /**