alert提示窗口样式处理

代码是从网上摘抄的，感觉应该显示的样字和代码描述的不一致，不过实际上这样的效果正是我要的，所以就没修改了，哈哈！

晕，今天才发现在FIREFOX和IE上显示的效果不一样，不好意思，效果没达到，请各位看官收下留情。文章就不删了！

<html xmlns="http://www.w3.org/1999/xhtml">
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>
</title>
<script language="javascript" type="text/javascript">
    function DoAlert() {
        alert(\'管他，能用就行！\');
    }
</script>
</head>
<body>
        <input id="TestAlert" type="button" onclick="DoAlert()" value="TestAlert" />
</body>
</html>

<script type="text/javascript">
    window.alert = function (txt) {
    document.write(\'<table width="300" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">\');
    document.write(\'  <tr>\');
    document.write(\'    <td align="center" bgcolor="#CCCCCC">操作提示</td>\');
    document.write(\'  </tr>\');
    document.write(\'  <tr>\');
    document.write(\'    <td bgcolor="#FFFFFF">\' + txt + \'</td>\');
    document.write(\'  </tr>\');
    document.write(\'  <tr>\');
    document.write(\'    <td align="center" bgcolor="#FFFFFF"><input type="button" name="Submit" value="返回" onclick="window.history.go(-1)"/>\');
    document.write(\'    <input type="button" name="Submit2" value="关闭"  onclick="window.close()"/></td>\');
    document.write(\'  </tr>\');
    document.write(\'</table>\');
</script>