diff --git a/scour.inkscape.py b/scour.inkscape.py
index 9e87757..f21e223 100755
--- a/scour.inkscape.py
+++ b/scour.inkscape.py
@@ -37,10 +37,13 @@ class ScourInkscape (inkex.Effect):
         self.OptionParser.add_option("--indent",
             action="store", type="string", dest="indent_type", default="space",
             help="indentation of the output: none, space, tab (default: %default)")
+        self.OptionParser.add_option("--enable-viewboxing", type="inkbool",
+            action="store", dest="enable_viewboxing", default=False,
+            help="changes document width/height to 100%/100% and creates viewbox coordinates")
 
 
     def effect(self):   
-        input = file(sys.argv[11], "r")
+        input = file(sys.argv[12], "r")
         sys.stdout.write(scourString(input.read(), self.options).encode("UTF-8"))
         input.close()
         sys.stdout.close()
diff --git a/scour.inx b/scour.inx
index d5cddee..ee310c5 100644
--- a/scour.inx
+++ b/scour.inx
@@ -13,6 +13,7 @@
             <param name="enable-id-stripping"  type="boolean" _gui-text="Enable id stripping">false</param>
             <param name="embed-rasters"  type="boolean" _gui-text="Embed rasters">true</param>
             <param name="keep-editor-data"  type="boolean" _gui-text="Keep editor data">false</param>
+            <param name="enable-viewboxing" type="boolean" _gui-text="Enable viewboxing">false</param>
             <param name="strip-xml-prolog"  type="boolean" _gui-text="Strip xml prolog">false</param>
             <param name="set-precision"  type="int" _gui-text="Set precision">5</param>
       	    <param name="indent" type="enum" _gui-text="Indent">
@@ -29,6 +30,7 @@
     * Enable id stripping: remove all un-referenced ID attributes.
     * Embed rasters: embed rasters as base64-encoded data.
     * Keep editor data: don't remove Inkscape, Sodipodi or Adobe Illustrator elements and attributes.
+    * Enable viewboxing: size image to 100%/100% and introduce a viewBox
     * Strip xml prolog: don't output the xml prolog.
     * Set precision: set number of significant digits (default: 5).
     * Indent: indentation of the output: none, space, tab (default: space).</_param>
diff --git a/scour.py b/scour.py
index 6841b1b..700a034 100755
--- a/scour.py
+++ b/scour.py
@@ -3,7 +3,7 @@
 
 #  Scour
 #
-#  Copyright 2009 Jeff Schiller
+#  Copyright 2010 Jeff Schiller
 #
 #  This file is part of Scour, http://www.codedread.com/scour/
 #
@@ -73,7 +73,7 @@ except ImportError:
 
 APP = 'scour'
 VER = '0.23'
-COPYRIGHT = 'Copyright Jeff Schiller, 2009'
+COPYRIGHT = 'Copyright Jeff Schiller, 2010'
 
 NS = { 	'SVG': 		'http://www.w3.org/2000/svg', 
 		'XLINK': 	'http://www.w3.org/1999/xlink', 
@@ -510,19 +510,17 @@ def removeUnusedDefs(doc, defElem, elemsToRemove=None):
 
 	keepTags = ['font', 'style', 'metadata', 'script', 'title', 'desc']
 	for elem in defElem.childNodes:
-		# we only inspect the children of a group in a defs if the group
-		# is not referenced anywhere else
-		if elem.nodeName == 'g' and elem.namespaceURI == NS['SVG'] and \
-				not elem.getAttribute('id') in referencedIDs:
-			elemsToRemove = removeUnusedDefs(doc, elem, elemsToRemove)
-			continue
-		
-		# we only remove if it is an element with a blank id and it is
-		# a direct child of the defs
+		# only look at it if an element and not referenced anywhere else
 		if elem.nodeType == 1 and (elem.getAttribute('id') == '' or \
-				(not elem.getAttribute('id') in referencedIDs)) and \
-				not elem.nodeName in keepTags:
-			elemsToRemove.append(elem)
+				(not elem.getAttribute('id') in referencedIDs)):
+
+			# we only inspect the children of a group in a defs if the group
+			# is not referenced anywhere else
+			if elem.nodeName == 'g' and elem.namespaceURI == NS['SVG']:
+				elemsToRemove = removeUnusedDefs(doc, elem, elemsToRemove)
+			# we only remove if it is not one of our tags we always keep (see above)
+			elif not elem.nodeName in keepTags:
+				elemsToRemove.append(elem)
 	return elemsToRemove
 
 def removeUnreferencedElements(doc):
diff --git a/testscour.py b/testscour.py
index edf459f..b618e1f 100755
--- a/testscour.py
+++ b/testscour.py
@@ -3,7 +3,7 @@
 
 #  Test Harness for Scour
 #
-#  Copyright 2009 Jeff Schiller
+#  Copyright 2010 Jeff Schiller
 #
 #  This file is part of Scour, http://www.codedread.com/scour/
 #