It took some searching to verify my memory, but here it is:
Quote:
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The id attribute value must begin with a letter in the roman alphabet (a–z or A–Z); this can be followed by any combination of letters (a–z or A–Z), digits (0–9), hyphens (-), underscores (_), colons (:), and periods (.). The id value is case sensitive, thus <span id="me">This is me</span> and <span id="ME">This is me</a> would be considered to be separate and uniquely identifiable elements on the same web page.
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Maybe make your ids like "en-1" instead of "1".