Widget用評価遅延処理

Widget(ブログパーツ)の読み込みなどでページのレンダリングが遅くなる場合があるけど、それを回避する話。
How To Keep Widgets From Slowing Down Sites: WEDJE

WEDJE is similar to the innerHTML method above except it creates what is effectively a cross-platform, cross-browser defer, enabling your script to load and execute asynchronously across all environments. We write out a div with javascript, then we create a script element with javascript, and then we append the script element to the div, again with javascript.

例。
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[/html] document.write() は使わないほうがいい、という話もあるので修正版。
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