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Javascript Element - 如何单击p元素更改标题

paragraph 【paragraph】
我们想知道如何单击p元素更改标题。
代码展示 运行结果 

<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){
document.querySelector("#right").addEventListener("click", funcRight);
function funcRight() {
    var month = document.getElementsByTagName("h4").item(0);
    if (month.innerHTML == "August 2014"){
        month.innerHTML="September 2014";
    } else if (month.innerHTML == "September 2014"){
        month.innerHTML="October 2014";
    }
}
}
</script>
</head>
<body>
  <h4 align="center">August 2014</h4>
  <p id="right">next</p>
</body>
</html>