+1  A: 

That's the animated image you can replace with your own if you have one.

DangIT
Thx. have updated my post can you please check and advise.
zapping
The progress bar is dynamically injected to the bottom of a container where a control is using it. You can somehow target it using the control id and use YourControlID_Prog to manipulate the positioning. Hope this works!
DangIT
A: 

Agree with @DangIT, you can find the gif with name progressbar.gif in images folder in the root of dnn installation. just delete it, and place another image with the same name will do the trick for you

lakhlaniprashant.blogspot.com
Thx. have updated my post can you please check and advise.
zapping
check this - http://mattberseth.com/blog/2007/08/disable_updatepanel_contents_d.html
lakhlaniprashant.blogspot.com