我所做的示例
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
#div1 {
height:150px;
width:100px;
background:#3C0;
display:block;
border:1px solid #000;
}
</style>
<script>
function show(){
var odiv=document.getElementById('div1');
if(odiv.style.display=='none')
{
odiv.style.display='block';
}
else
{
odiv.style.display='none';
}
}
</script>
</head>
<body>
<input type="button" value="显示隐藏" οnclick="show()"/>
<div id="div1">
</div>
</body>
</html>