diff --git a/overviewer.py b/overviewer.py
index 00c2c49..4faad85 100755
--- a/overviewer.py
+++ b/overviewer.py
@@ -352,7 +352,7 @@ dir but you forgot to put quotes around the directory, since it contains spaces.
     # Now we start the actual processing, now that all the configuration has
     # been gathered and validated
     # create our asset manager... ASSMAN
-    assetMrg = assetmanager.AssetManager(destdir)
+    assetMrg = assetmanager.AssetManager(destdir, config.get('customwebassets', None))
 
     tilesets = []
 
diff --git a/overviewer_core/assetmanager.py b/overviewer_core/assetmanager.py
index 983f1e3..984c7f9 100644
--- a/overviewer_core/assetmanager.py
+++ b/overviewer_core/assetmanager.py
@@ -33,13 +33,14 @@ same time, controls the generated javascript files in the output directory.
 There should only be one instances of these per execution.
     """
 
-    def __init__(self, outputdir):
+    def __init__(self, outputdir, custom_assets_dir=None):
         """\
 Initializes the AssetManager with the top-level output directory.  
 It can read/parse and write/dump the overviewerConfig.js file into this top-level
 directory. 
         """
         self.outputdir = outputdir
+        self.custom_assets_dir = custom_assets_dir
         self.renders = dict()
 
         # look for overviewerConfig in self.outputdir
@@ -141,7 +142,12 @@ directory.
             global_assets = os.path.join(util.get_program_path(), "web_assets")
         mirror_dir(global_assets, self.outputdir)
 
-		# write a dummy baseMarkers.js if none exists
+        if self.custom_assets_dir:
+            # Could have done something fancy here rather than just overwriting
+            # the global files, but apparently this what we used to do pre-rewrite.
+            mirror_dir(self.custom_assets_dir, self.outputdir)
+
+	# write a dummy baseMarkers.js if none exists
         if not os.path.exists(os.path.join(self.outputdir, "baseMarkers.js")):
             with open(os.path.join(self.outputdir, "baseMarkers.js"), "w") as f:
                 f.write("// if you wants signs, please see genPOI.py\n");
diff --git a/overviewer_core/settingsDefinition.py b/overviewer_core/settingsDefinition.py
index d3a83c0..ce04dc1 100644
--- a/overviewer_core/settingsDefinition.py
+++ b/overviewer_core/settingsDefinition.py
@@ -84,7 +84,7 @@ renders = Setting(required=True, default=util.OrderedDict(),
             "showspawn": Setting(required=False, validator=validateBool, default=True),
             "base": Setting(required=False, validator=validateStr, default=""),
             "poititle": Setting(required=False, validator=validateStr, default="Signs"),
-
+            "customwebassets": Setting(required=False, validator=validateWebAssetsPath, default=None),
             # Remove this eventually (once people update their configs)
             "worldname": Setting(required=False, default=None,
                 validator=error("The option 'worldname' is now called 'world'. Please update your config files")),
diff --git a/overviewer_core/settingsValidators.py b/overviewer_core/settingsValidators.py
index 0d0299e..015b00d 100644
--- a/overviewer_core/settingsValidators.py
+++ b/overviewer_core/settingsValidators.py
@@ -214,6 +214,18 @@ def validateDefaultZoom(z):
     else:
         raise ValidationException("The default zoom is set below 1")
 
+def validateWebAssetsPath(p):
+    try:
+        validatePath(p)
+    except ValidationException as e:
+        raise ValidationException("Bad custom web assets path: %s" % e.message)
+
+def validatePath(p):
+    _, path = checkBadEscape(p)
+    abs_path = expand_path(path)
+    if not os.path.exists(abs_path):
+        raise ValidationException("'%s' does not exist. Path initially given as '%s'" % (abs_path,p))
+
 def make_dictValidator(keyvalidator, valuevalidator):
     """Compose and return a dict validator -- a validator that validates each
     key and value in a dictionary.