googleMAp - Re-drawing polylines problem

Hi,
I am tring to draw a fence on google map on "click" event
Once this fence is drawn using polylines, I ask the user to click the
button "DONE" after which the page gets refreshed.

Here(after refresh) on this page I am again re-drawing the original fence(polylines)
which the user had drawn...but am unable to do it..

Have a look at the link :-
http://58.68.117.41:81/googlemapdemo/geofencing.aspx (view source)


My code behind is

Code:

---

  protected void Page_Load(object sender, EventArgs e)
  {
      Literal1.Text = "<script>initialize();</script>";
  }

  protected void btnDone_Click(object sender, EventArgs e)
  {

          Literal1.Text = "<script>redrawFence();</script>";

  }

---

Pls help..
I want to re-draw the fence (polylines) the user had drawn before clicking DONE button