patch: correctness of <script> tag attributes

[John Sullivan]

We discovered a web page that hangs in an infinite JavaScript loop that 
doesn't hang on other browsers because the <script> tag had a 
deliberately bad value for its language attribute of 
"disabled_JavaScript". Our test for valid values of the language and 
type attributes of the <script> tag was much more permissive than other 
browsers, so we accepted "disabled_JavaScript" as a valid value.

Here's the patch, and a test page that shows a variety of values of 
"language" and "type" that can be compared against different browsers.

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The page that was hanging before this fix is http://www.riibe.com

John