Javascript Hassles - Again

I've been thinking XML too much and put the following javascript in a page:

      <script type="text/javascript" src="includes/Common.js" />

The real line should have been:

      <script type="text/javascript" src="includes/Common.js" ></script>

It's not XML so what would happen?  Mostly nothing.  Even on the simplest page, no Javascript errors.  Pasting the actual javascript in the page showed no errors.  It just can't handle the syntax so parts of the page would not show, particularly StyleSheetTheme images from a CSS when used in a MasterPage.  All the while it was this syntax.  

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