Four Methods to Create Equal Height Columns | Build Internet!
http://buildinternet.com/2009/07/four-methods-to-create-equal-height-columns/

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This tutorial describes a really simple CSS trick to implement a fake equal height columns effect using the CSS properties position:absolute and border. Before to proceed I suggest you to download my CSS 2 Visual Cheat Sheet for a practical reference guide to CSS 2 properties that can help you understand concepts illustrated in this post.

参考に

naturalWidthとnaturalHeightは知らなかった。Imageオブジェクトのonloadが無難。

imageのwidth,height