javascript 搜索框效果

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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>
    <title>搜索框效果</title>
    <script type="text/javascript">
        function iniEvent() {
            var txtSearch = document.getElementById("txtSearch");
            txtSearch.onfocus = function () {
                if (this.value == "请输入关键字" || this.value == "") {
                    this.value = "";
                    this.style.color = "black"; //修改文本框字体颜色
                }
            }
            txtSearch.onblur = function () {
                if (this.value == "请输入关键字" || this.value == "") {
                    this.value = "请输入关键字";
                    this.style.color = "red";   //修改文本框字体颜色
                }
                else {
                    this.style.color = "black";
                }
            }
        }
    </script>
</head>
<body onload="iniEvent()">
    
    
    查找<input type="text" id="txtSearch" value="请输入关键字" style="color:red" /><br /><input type="text" />
</body>
</html>