I do not think it's a good idea.
From yslow best practices
http://developer.yahoo.com/performance/rules.html#external
Using external files in the real world usually creates faster pages because the JavaScript and CSS files are cached by the browser. JavaScript and CSS, which are embedded in HTML documents, are loaded every time an HTML document is requested. This reduces the number of HTTP requests that are needed, but increases the size of the HTML document. On the other hand, if JavaScript and CSS are in external files cached by the browser, the size of the HTML document is reduced without increasing the number of HTTP requests.
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