diff --git a/tools/build.py b/tools/build.py
index b002c39..70955b9 100644
--- a/tools/build.py
+++ b/tools/build.py
@@ -16,17 +16,26 @@ def ReplaceInFile (filePath, source, dest):
 	file = open (filePath, 'rb')
 	content = file.read ();
 	file.close ()
-	content = content.replace (source, dest)
+	content = re.sub (source, dest, content, flags = re.MULTILINE | re.DOTALL)
 	file = open (filePath, 'wb')
 	file.write (content);
 	file.close ()
 	
-def BuildWebSite (rootFolder, resultFolder):
+def BuildWebSite (rootFolder, resultFolder, extensions):
 	targetFolder = os.path.join (resultFolder, 'website')
 	shutil.copytree (os.path.join (rootFolder, 'website'), targetFolder)
 	shutil.copytree (os.path.join (rootFolder, 'jsmodeler'), os.path.join (targetFolder, 'jsmodeler'))
 	indexFilePath = os.path.join (targetFolder, 'index.html')
+	importerAppFilePath = os.path.join (targetFolder, 'include', 'importerapp.js')
 	ReplaceInFile (indexFilePath, '../jsmodeler/', 'jsmodeler/')
+	extensionIncludes = ''
+	for extension in extensions:
+		extensionIncludes += '<script type="text/javascript" src="' + extension['path'] + '"></script>\r\n\t'
+	ReplaceInFile (indexFilePath, '\<\!\-\- ExtensionIncludes \-\-\>.*\<\!\-\- ExtensionIncludesEnd \-\-\>', extensionIncludes)
+	extensionIncludes = ''
+	for extension in extensions:
+		extensionIncludes += 'importerApp.AddExtension (new ' + extension['name'] + ' ());\r\n\t'
+	ReplaceInFile (importerAppFilePath, '\/\/ ExtensionIncludes.*\/\/ ExtensionIncludesEnd', extensionIncludes)
 	
 def BuildEmbeddable (rootFolder, resultFolder):
 	targetFolder = os.path.join (resultFolder, 'embeddable')
@@ -38,6 +47,15 @@ def BuildEmbeddable (rootFolder, resultFolder):
 	ReplaceInFile (indexFilePath, '../jsmodeler/', 'jsmodeler/')
 	
 def Main ():
+	extensions = []
+	i = 1
+	while i < len (sys.argv):
+		extensions.append ({
+			'name' : sys.argv[i],
+			'path' : sys.argv[i + 1]
+		});
+		i += 2
+		
 	rootFolder = os.path.abspath ('..')
 	resultFolder = os.path.join (rootFolder, 'build')
 	if os.path.exists (resultFolder):
@@ -45,7 +63,7 @@ def Main ():
 	os.mkdir (resultFolder)
 	
 	PrintInfo ('Building website to folder <' + resultFolder + '>.')
-	BuildWebSite (rootFolder, resultFolder)
+	BuildWebSite (rootFolder, resultFolder, extensions)
 
 	PrintInfo ('Building embeddable example to folder <' + resultFolder + '>.')
 	BuildEmbeddable (rootFolder, resultFolder)
diff --git a/website/extensions/example/example.js b/website/extensions/example/example.js
index d0fb459..26d06f8 100644
--- a/website/extensions/example/example.js
+++ b/website/extensions/example/example.js
@@ -5,7 +5,7 @@ ExampleExtension = function ()
 
 ExampleExtension.prototype.IsEnabled = function ()
 {
-	return false;
+	return true;
 };
 
 ExampleExtension.prototype.Init = function (extensionInterface)
diff --git a/website/include/importerapp.js b/website/include/importerapp.js
index 412eb15..4ef33d7 100644
--- a/website/include/importerapp.js
+++ b/website/include/importerapp.js
@@ -550,5 +550,7 @@ window.onload = function ()
 {
 	var importerApp = new ImporterApp ();
 	importerApp.Init ();
+	// ExtensionIncludes
 	importerApp.AddExtension (new ExampleExtension ());
+	// ExtensionIncludesEnd
 };
diff --git a/website/index.html b/website/index.html
index c5b33d0..d3814d7 100644
--- a/website/index.html
+++ b/website/index.html
@@ -18,7 +18,9 @@
 	<script type="text/javascript" src="include/importermenu.js"></script>
 	<script type="text/javascript" src="include/importerapp.js"></script>
 	
+	<!-- ExtensionIncludes -->
 	<script type="text/javascript" src="extensions/example/example.js"></script>
+	<!-- ExtensionIncludesEnd -->
 
 	<script>
 	  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){