点击一个div隐藏另一个div

<!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=gb2312" />
<title>点击一个div隐藏另一个div</title>

<script type="text/javascript">
    function shwoOrHidden(){
    if(document.getElementById("d1").style.display=='block'){
    document.getElementById("d1").style.display='none';
    document.getElementById("d2").style.display='block';
    }else if(document.getElementById("d1").style.display=='none'){
    document.getElementById("d1").style.display='block';
    document.getElementById("d2").style.display='none';
}
}
</script>
</head>
<body>
    <div id="d1" style="height:150px; width:150px; border:1px solid #009900; display:block; position:absolute;" onclick="shwoOrHidden()">
    </div>

    <div id="d2" style="height:150px; width:150px; border:1px solid #FFFF00; display:none; position:absolute; left:200px;" onclick="shwoOrHidden()">
    </div>
</body>
</html>