UpdatePanel on Page Load

Hi,

i have a ScriptManager and an UpdatePanel on my Page. Inside the UpdatePanel i have an LiteralControl.

I need the following:

1. On Page Load i do a long running operation.

2. In this piece of time i need to show a progress/loading indicator only for this sections (the updatepanel)

3. when the operation completes, i want to hide the indicator and show the result WITHOUT reloading the page

I hope it was clear :)

thanks in advance

regards

Yavuz