<!--
// 画像反転
// which	0：元に戻す、1：反転
function makevisible(obj, which){
	strength = (which == 0) ? 1 : 0.8;
	if (obj.style.MozOpacity) {
		obj.style.MozOpacity=strength;
	} else if (obj.filters) {
		obj.filters.alpha.opacity = strength * 100;
	}
}
//-->