Confirmation Message Box For Button or LinkButton ...etc

script language="javascript" type="text/javascript">
function cof()
{
var answer = confirm("Are you sure you want to delete this page?")
if (answer)
{
alert("Successfully Deleted the page.")
document.getElementById("<%=HiddenField1.ClientID%>").value='1';
}
else {

document.getElementById("<%=HiddenField1.ClientID%>").value='2';
// window.location.href = "MessageBxTest.aspx"
}
}
/script>


---------------------------
asp:LinkButton ID="LinkButton1" runat="server" onclick="LinkButton1_Click" OnClientClick="cof()" >Delete /asp:LinkButton>
asp:Label ID="Label1" runat="server" Text="">/asp:Label>
asp:HiddenField ID="HiddenField1" runat="server" />


Code Part
---------------------------
protected void LinkButton1_Click(object sender, EventArgs e)
{
if (HiddenField1.Value == "1")
{
Label1.Text = "Delete Successssssss";
}
}