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function over(obj) {
obj.src = "image/dog.jpg"
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function out(obj) {
obj.src = "image/cat.jpg"
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<h3>마우스를 올려 보세요</h3>
<img src="./image/cat.jpg" alt="고양이 이미지" onmouseover="over(this)" onmouseout="out(this)">
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<img src="image/dog.jpg" alt="개 이미지" onmouseover="over(this)" onmouseout="out(this)">>
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