Countdown timer on ASP.NET page

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
    <asp:Label ID="Label1" runat="server">60</asp:Label>
    <asp:Timer ID="Timer1" runat="server" Interval="1000"
        ontick="Timer1_Tick">
    </asp:Timer>
</ContentTemplate>
</asp:UpdatePanel>

protected void Timer1_Tick(object sender, EventArgs e)
{
    int seconds = int.Parse(Label1.Text);
    if (seconds > 0)
        Label1.Text = (seconds - 1).ToString();
    else
        Timer1.Enabled = false;
}

<span id="timerLabel" runat="server"></span>

<script type="text/javascript">

    function countdown()
    {
        seconds = document.getElementById("timerLabel").innerHTML;
        if (seconds > 0)
        {
            document.getElementById("timerLabel").innerHTML = seconds - 1;
            setTimeout("countdown()", 1000);
        }
    }

    setTimeout("countdown()", 1000);

</script>

<form name="counter"><input type="text" size="8"
name="d2"></form>

<script>
<!--
//
 var milisec=0
 var seconds=30
 document.counter.d2.value='30'

function display(){
 if (milisec<=0){
    milisec=9
    seconds-=1
 }
 if (seconds<=-1){
    milisec=0
    seconds+=1
 }
 else
    milisec-=1
    document.counter.d2.value=seconds+"."+milisec
    setTimeout("display()",100)
}
display()
-->
</script>

var sec=0 ;
 var min=0;
var hour=0;
var t;

function display(){
 if (sec<=0){
    sec+=1;
 }
if(sec==60)
{
sec=0;
min+=1;
}
if(min==60){
hour+=1;
min=0;
}

 if (min<=-1){
    sec=0;
    min+=1;
 }

 else
    sec+=1 ;
document.getElementById("<%=TextBox1.ClientID%>").value=hour+":"+min+":"+sec;
    t=setTimeout("display()",1000);
    }
window.onload=display;

time1 = (DateTime)ViewState["time"] - DateTime.Now;

if (time1.TotalSeconds <= 0)
{
    Label1.Text = Label2.Text = "TimeOut!";
}
else
{
    if (time1.TotalMinutes > 59)
    {
        Label1.Text = Label2.Text = string.Format("{0}:{1:D2}:{2:D2}",
                                                time1.Hours,
                                                time1.Minutes,
                                                time1.Seconds);
    }
    else
    {
        Label1.Text = Label2.Text = string.Format("{0:D2}:{1:D2}",
                                                time1.Minutes,
                                                time1.Seconds);
    }
}

time1 = (DateTime)ViewState["time"] - DateTime.Now;

        if (time1.TotalSeconds <= 0)
        {
            Label1.Text = Label2.Text = "TimeOut!";
        }
        else
        {
            if (time1.TotalMinutes > 59)
            {
                Label1.Text = Label2.Text = string.Format("{0}:{1:D2}:{2:D2}",
                                                        time1.Hours,
                                                        time1.Minutes,
                                                        time1.Seconds);
            }
            else
            {
                Label1.Text = Label2.Text = string.Format("{0:D2}:{1:D2}",
                                                        time1.Minutes,
                                                        time1.Seconds);
            }
        }