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var interval = 50;

if(!this.getComputedStyle) {
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    if(document.defaultView) {
        getComputedStyle = function(element) {
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なんでこんな変な形とかが表示されるんかのう。getComputedStyle がミソか?

しかし "y" の人、こういうの好きなんだなあ。なんか勝手にガンガン、ページが書き換わるヤツ。

typeof computedStyle[i].replace != 'undefined' の replace ってどういう意味だろう?