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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Untitled Document</title>
</head>
<body id="bodyid" >
<input type="button" value="ç¹æ" id="b" >
<div id="bb" style="background-color:red;width:500px;height:500px;display:none;" ></div>
<script type="text/javascript">
document.getElementById("b").onclick = function(){
var style = document.getElementById("bb").style;
var displ = style.display;
if(displ == "" || displ == "none"){
style.display = "block";
}else{
style.display = "none";
}
}
</script>
</body>
</html>