javascript鼠标点入input内value值隐藏事件

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<!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>鼠标事件</title>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.0/jquery.min.js">
        </script>
        

        


        <script type="text/javascript">
           //javascript方法2
            function dValue(){
                oe = document.getElementById("myinput");
                oe.onfocus = function(){
                    if (this.value == "站内搜索")
                        this.value = "";
                };
                oe.onblur = function(){
                    if (this.value == "")
                        this.value = "站内搜索";
                }
            }
            window.onload = dValue;
        </script>
    </head>
    <body>
        <input type="text" id="myinput" value="站内搜索" size="35"/>
    </body>
</html>