How to display MessageBox with 'OkCancel' Button in asp.net

Hi ,
I need to display a meesage Box with OkCancel button.So when user click "Ok" button I need to do something else nothing.
My web page is with ContentPage without html tag. So i dont know where to place my java script.
But i registered it when page load. When I clicked on the save button the messageBox does not appear and
with error " Expected ';' "
Can someone advise me on this..thanks.
 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim script As String = ""
        script = "<script language=javascript id='MessageBox'>" & _
                    "funcion(Save()) " & _
 &nbs ...