Can I suggest that you put the closing angle bracket on the script tag? ie. change:

  <script="javascript" src="demo.js"</script>
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to

  <script="javascript" src="demo.js"></script>
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Personally I would change that entire line to read:

  <script type=\"text/javascript\" src=\"demo.js\"></script>
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Why, you ask? Well a tag name (such as script) should have a space before the first argument (type=\"text/javascript\"). Also the quote marks should be escaped within a Perl string as mentioned above.

update: reformatted mis-escaped <code> tag.

update: accidently pressed the update button twice.