Display Processing Message during long time process

[Guest]

I have a page when it starts loading, it will perform a long time process!
So, the Page is empty during this time.
I want to add a Processing Message, eg
Processing.
Processing..
Processing...

My program structure (language VB)

<script runat="server">
Sub page_Load(..)

long time processing(30sec to 60sec)

End Sub
</script>

Thank You