<html>
<body>
<script language="Javascript">
function Click_Sub() {
if (document.all.div1.style.display == "none") {
document.all.div1.style.display = "block"
} else {
document.all.div1.style.display = "none"
}
}
</script>
<input type="button" value="クリック" onclick="Click_Sub()">
<div id=div1>表示・非表示</div>
</body>
</html>
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