$ irb
ruby-1.8.7-p302 > require 'rubygems'
ruby-1.8.7-p302 > require 'harmony'
 => true 
ruby-1.8.7-p302 > page = Harmony::Page.new
 => #<Harmony::Page:0x101850cf8> 
ruby-1.8.7-p302 > page.load('right-src.js')
Johnson::Error: RightJS.$A(document.getElementsByTagName("script")).last() is undefined
	from right-src.js:5474 [JavaScript]
	from right-src.js:5484 [JavaScript]
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/johnson-2.0.0.pre3/lib/johnson/tracemonkey/runtime.rb:49:in `evaluate_compiled_script'
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/envjs-0.3.7/lib/envjs/runtime.rb:53:in `evaluate'
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/envjs-0.3.7/lib/envjs/runtime.rb:189:in `extended'
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/johnson-2.0.0.pre3/lib/johnson/tracemonkey/js_land_proxy.rb:16:in `call'
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/johnson-2.0.0.pre3/lib/johnson/tracemonkey/js_land_proxy.rb:16:in `__send__'
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/johnson-2.0.0.pre3/lib/johnson/tracemonkey/js_land_proxy.rb:16:in `send_with_possible_block'
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/johnson-2.0.0.pre3/lib/johnson/ruby_land_proxy.rb:110:in `call_function_property'
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/envjs-0.3.7/lib/envjs/env.js:105 [JavaScript]
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/johnson-2.0.0.pre3/lib/johnson/ruby_land_proxy.rb:110:in `method_missing'
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/harmony-0.5.6/lib/harmony/page.rb:76:in `load'
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/harmony-0.5.6/lib/harmony/page.rb:75:in `each'
	from /Users/jp/.rvm/gems/ruby-1.8.7-p302/gems/harmony-0.5.6/lib/harmony/page.rb:75:in `load'
	from (irb):4