However, when I view my page from localhost from IIS, the fade out doesn't work.
The images fade in, but they do not fade out - they just disappear.
Then when the On Updating animation fires the Script Action, find the div, set the display back to visible, figure out the bounds of both the Grid View and the progress div, and finally do the math to determine when the div needs to be placed to overlay the Grid View.
The on Updated function just sets the display style of the div back to none.
It can done easy with the help of the Update Panel Animation Extender.
Only placing the animated gif in the center of the Grid View was only slightly more difficult.
I installed the AJAX Toolkit and I'm attempting to make an image slideshow within the Update Panel using the Timer control.