diff --git a/lib/bundle_fu.rb b/lib/bundle_fu.rb
index 5991b97..b6868c7 100644
--- a/lib/bundle_fu.rb
+++ b/lib/bundle_fu.rb
@@ -29,6 +29,8 @@ def bundle_js_files(filenames=[], options={})
         if options[:compress]
           if Object.const_defined?("Packr")
             content
+          elsif Object.const_defined?("YUI")
+            content
           else
             JSMinimizer.minimize_content(content)
           end
@@ -40,6 +42,9 @@ def bundle_js_files(filenames=[], options={})
       if Object.const_defined?("Packr")
         # use Packr plugin (http://blog.jcoglan.com/packr/)
         Packr.new.pack(output, options[:packr_options] || {:shrink_vars => false, :base62 => false})
+      elsif Object.const_defined?("YUI")
+        compressor = YUI::JavaScriptCompressor.new(options[:yui_js_options] || {:munge => true})
+        compressor.compress(output)
       else
         output
       end
@@ -48,7 +53,13 @@ def bundle_js_files(filenames=[], options={})
 
     def bundle_css_files(filenames=[], options = {})
       bundle_files(filenames) { |filename, content|
-          BundleFu::CSSUrlRewriter.rewrite_urls(filename, content)
+        content = BundleFu::CSSUrlRewriter.rewrite_urls(filename, content)
+        # use YUI compressor
+        if Object.const_defined?("YUI")
+          compressor = YUI::CssCompressor.new(options[:yui_css_options] || {})
+          content = compressor.compress(content)
+        end
+        content
       }
     end
   end
diff --git a/lib/bundle_fu/js_minimizer.rb b/lib/bundle_fu/js_minimizer.rb
index cef0461..4ca7789 100644
--- a/lib/bundle_fu/js_minimizer.rb
+++ b/lib/bundle_fu/js_minimizer.rb
@@ -47,7 +47,7 @@ def isAlphanum(c)
      return false if !c || c == EOF
      return ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
              (c >= 'A' && c <= 'Z') || c == '_' || c == '$' ||
-             c == '\\' || c[0] > 126)
+             c == '\\' || c[0..0] > '~')
   end
   
   # get -- return the next character from input. Watch out for lookahead. If
@@ -214,4 +214,4 @@ def self.minimize_content(content)
     js_minimizer.output.string
   end
   
-end
\ No newline at end of file
+end