.NET中遇到了js一个小疑点，请各位大仙指点迷经。多谢

.NET中遇到了js一个小问题，请各位大仙指点迷经。谢谢
各位大神！今天遇到一个问题，不知道那里出了问题（就是有js编写只含时分秒的简单秒表，但是秒只能到08就又从00开始了？搞不通为什么？那位大神给解释一下，详细点。在线等！！！！谢谢）一下为程序代码：

<!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>无标题页</title>
<script type="text/javascript" language="javascript">
var time = new String;
function TimeOpen() {
var miunte = document.form1.txt2.value;
var hour = document.form1.txt1.value;
var t = new Date;
var seconds =parseInt(document.form1.txt3.value)+1;
if (seconds < 10)
seconds = "0"+seconds;
document.form1.txt3.value = seconds;
if (document.form1.txt3.value == 00)
{
miunte = parseFloat(miunte) + 1;
if (document.form1.txt2.value >= 60)
{
hour = parseFloat(hour) + 1;
if (hour < 0)
{
hour = "0" + hour;
}
else if (hour >= 24)
{
hour = parseFloat(hour) - 24;
}
document.form1.txt1.value = hour;
}
if (miunte < 10)
{
miunte = "0" + miunte;
}
else if (miunte > 60)
{
miunte = parseFloat(miunte) - 60;
}
document.form1.txt2.value = miunte;
}

time = setTimeout("TimeOpen()",1000);
}
function TimeStep() {
time = clearTimeout(time);
}

</script>
<style type="text/css">
#Button1
{
width: 62px;
}
#Button2
{
width: 62px;
}
.type1
{
text-align:right;
}
</style>
</head>
<body>
<center>
<form name="form1">
<table style="width:68%;">
<tr align="center">
<td>
<input class="type1" id="Text1" type="text" name="txt1" value="00" />时</td>
<td>
<input class="type1" id="Text2" type="text" name="txt2" value="00" />分</td>
<td>
<input class="type1" id="Text3" type="text" name="txt3" value="00"/>秒</td>
</tr>
<tr align="center">
<td>
<input id="Button1" type="button" value="开始" onclick="TimeOpen()"/></td>
<td>
 </td>
<td>

.NET中遇到了js一个小疑点，请各位大仙指点迷经。多谢

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