Load the busy indicator until the process is complete

Hi

I need to show the busy indicator when some action is taken and i should show the time until the process gets completed.

I refered "http://aspsnippets.com/Articles/Display-loading-progress-image-when-Page-Loads-or-does-PostBack-using-ASPNet.aspx" link and its great.

But i found the code

System.Threading.Thread.Sleep(5000);.

i should not add the fake delay as it is my process is long process to run

Can any one give me an idea about how to achive this.