diff --git a/src/calibre/constants.py b/src/calibre/constants.py
index 5de41e25ee..f0e7b0d0c3 100644
--- a/src/calibre/constants.py
+++ b/src/calibre/constants.py
@@ -2,7 +2,7 @@ __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
 __appname__   = 'calibre'
-__version__   = '0.4.104'
+__version__   = '0.4.105'
 __author__    = "Kovid Goyal <kovid@kovidgoyal.net>"
 '''
 Various run time constants.
diff --git a/src/calibre/ebooks/metadata/meta.py b/src/calibre/ebooks/metadata/meta.py
index b30691fbc2..ae1af1a47d 100644
--- a/src/calibre/ebooks/metadata/meta.py
+++ b/src/calibre/ebooks/metadata/meta.py
@@ -20,7 +20,11 @@ from calibre.ebooks.metadata.opf2 import OPF
 from calibre.ebooks.metadata.rtf  import set_metadata as set_rtf_metadata
 from calibre.ebooks.lrf.meta      import set_metadata as set_lrf_metadata
 from calibre.ebooks.metadata.epub import set_metadata as set_epub_metadata
-from calibre.libunrar import extract_member as rar_extract_first
+try:
+    from calibre.libunrar import extract_member as rar_extract_first
+except OSError:
+    rar_extract_first = None
+    
 from calibre.libunzip import extract_member as zip_extract_first
 
 from calibre.ebooks.metadata import MetaInformation
diff --git a/src/calibre/ebooks/mobi/reader.py b/src/calibre/ebooks/mobi/reader.py
index 3d4ec4a72d..41e6cb8417 100644
--- a/src/calibre/ebooks/mobi/reader.py
+++ b/src/calibre/ebooks/mobi/reader.py
@@ -123,6 +123,9 @@ class BookHeader(object):
 class MobiReader(object):
     
     PAGE_BREAK_PAT = re.compile(r'(<[/]{0,1}mbp:pagebreak\s*[/]{0,1}>)+', re.IGNORECASE)
+    IMAGE_PATS     = map(re.compile, (r'\shirecindex=[\'"]{0,1}(\d+)[\'"]{0,1}', 
+                        r'\srecindex=[\'"]{0,1}(\d+)[\'"]{0,1}', 
+                        r'\slorecindex=[\'"]{0,1}(\d+)[\'"]{0,1}'))
     
     def __init__(self, filename_or_stream, verbose=False):
         self.verbose = verbose
@@ -405,10 +408,7 @@ class MobiReader(object):
             
         def fix_images(match):
             tag = match.group()
-            for pat in (r'\shirecindex=[\'"]{0,1}(\d+)[\'"]{0,1}', 
-                        '\srecindex=[\'"]{0,1}(\d+)[\'"]{0,1}', 
-                        '\slorecindex=[\'"]{0,1}(\d+)[\'"]{0,1}'):
-                pat = re.compile(pat)
+            for pat in self.IMAGE_PATS:
                 m = pat.search(tag)
                 if m:
                     return pat.sub(' src="images/%s.jpg"'%m.group(1), tag)