关于javascript的一个简单程序，请高手帮忙！

用记事本把下列代码保存为.htm格式，然后运行看看
<script>
function tick() {
var hours, minutes, seconds, xfile;
var intHours, intMinutes, intSeconds;
var today;
today = new Date();
intHours = today.getHours();
intMinutes = today.getMinutes();
intSeconds = today.getSeconds();
if (intHours == 0) {
hours = "12:";
xfile = "午夜";
} else if (intHours < 12) {
hours = intHours+":";
xfile = "上午";
} else if (intHours == 12) {
hours = "12:";
xfile = "正午";
} else {
intHours = intHours - 12
hours = intHours + ":";
xfile = "下午";
}
if (intMinutes < 10) {
minutes = "0"+intMinutes+":";
} else {
minutes = intMinutes+":";
}
if (intSeconds < 10) {
seconds = "0"+intSeconds+" ";
} else {
seconds =