diff --git a/src/calibre/ebooks/oeb/display/cfi.coffee b/src/calibre/ebooks/oeb/display/cfi.coffee
index 076277eaed..29815c8f77 100644
--- a/src/calibre/ebooks/oeb/display/cfi.coffee
+++ b/src/calibre/ebooks/oeb/display/cfi.coffee
@@ -4,9 +4,11 @@
 ###
  Copyright 2011, Kovid Goyal <kovid@kovidgoyal.net>
  Released under the GPLv3 License
- Based on code originally written by Peter Sorotkin (http://code.google.com/p/epub-revision/source/browse/trunk/src/samples/cfi/epubcfi.js)
+ Based on code originally written by Peter Sorotkin
+ (http://code.google.com/p/epub-revision/source/browse/trunk/src/samples/cfi/epubcfi.js)
 
- This script requires the createRange method on the document object that must create a W3C compliant range object
+ To check if this script is compatible with the current browser, call
+ window.cfi.is_compatible() it will throw an exception if not compatible.
 ###
 
 log = (error) -> # {{{
@@ -118,11 +120,24 @@ class CanonicalFragmentIdentifier
     # object
 
     constructor: () ->
-        this.COMPAT_ERR = "Your browser does not support the createRange function. Update it to a newer version."
+        this.CREATE_RANGE_ERR = "Your browser does not support the createRange function. Update it to a newer version."
+        this.IE_ERR = "Your browser is too old. You need Internet Explorer version 8 or newer."
+        this.is_compatible()
 
     is_compatible: () ->
         if not window.document.createRange
-            throw this.COMPAT_ERR
+            throw this.CREATE_RANGE_ERR
+        # Check if Internet Explorer >= 8 as getClientRects returns physical
+        # rather than logical pixels on older IE
+        div = document.createElement('div')
+        ver = 3
+        while true
+            div.innerHTML = "<!--[if gt IE #{ ++ver }]><i></i><![endif]-->"
+            if div.getElementsByTagName('i').length == 0
+                break
+        if ver > 4 and ver < 8
+            # We have IE < 8
+            throw this.IE_ERR
 
     set_current_time: (target, val) -> # {{{
         if target.currentTime == undefined
@@ -353,7 +368,7 @@ class CanonicalFragmentIdentifier
             else if cdoc.createRange
                 [target, offset] = find_offset_for_point(x, y, target, cdoc)
             else
-                throw this.COMPAT_ERR
+                throw this.CREATE_RANGE_ERR
 
         this.encode(doc, target, offset, tail)
     # }}}
@@ -375,7 +390,7 @@ class CanonicalFragmentIdentifier
         if typeof(r.offset) == "number"
             # Character offset
             if not ndoc.createRange
-                throw this.COMPAT_ERR
+                throw this.CREATE_RANGE_ERR
             range = ndoc.createRange()
             if r.forward
                 try_list = [{start:0, end:0, a:0.5}, {start:0, end:1, a:1}, {start:-1, end:0, a:0}]
diff --git a/src/calibre/ebooks/oeb/display/test/cfi-test.coffee b/src/calibre/ebooks/oeb/display/test/cfi-test.coffee
index e371bab4df..5c3bb6ee16 100644
--- a/src/calibre/ebooks/oeb/display/test/cfi-test.coffee
+++ b/src/calibre/ebooks/oeb/display/test/cfi-test.coffee
@@ -22,18 +22,18 @@ viewport_left = (node) ->
 show_cfi = (dont_seek) ->
     if window.current_cfi
         pos = window.cfi.point(window.current_cfi)
-        ms = document.getElementById("marker").style
         if pos
-            ms.visibility = "visible"
-            ms.top = (pos.y - 30) + window.scrollY + "px"
-            ms.left = (pos.x - 1) + window.scrollX + "px"
+            ms = $("#marker")
+            ms.offset({left:pos.x-1, top:pos.y-30})
+            ms.css('visibility', 'visible')
             if not dont_seek
                 if typeof pos.time == "number"
                     window.cfi.set_current_time(pos.node, pos.time)
                 scrollTo(0, pos.y - 30)
     null
 
-RELOAD = true
+# Set this to true to have the browser reload the page with the current cfi
+RELOAD = false
 
 mark_and_reload = (evt) ->
     window.current_cfi = window.cfi.at(evt.clientX, evt.clientY)
diff --git a/src/calibre/utils/coffeescript.py b/src/calibre/utils/coffeescript.py
index 13db6011f0..057cfeef17 100644
--- a/src/calibre/utils/coffeescript.py
+++ b/src/calibre/utils/coffeescript.py
@@ -70,7 +70,7 @@ class HTTPD(SocketServer.TCPServer):
 
 def serve(resources={}, port=8000):
     Handler.special_resources = resources
-    httpd = HTTPD(('localhost', port), Handler)
+    httpd = HTTPD(('0.0.0.0', port), Handler)
     print('serving at localhost:%d'%port)
     try:
         httpd.serve_forever()