The animated gif is working now. Thanks for you tip.
Also, I have posted a topic entitled SHOW/HIDE but have received no replies yet.
Could you please have a look at that post and let me know if you can give any help.
PathToNewImage = _appRoot + "/App_Themes/theme1/indicator.gif"
imagedisplay.src = PathToNewImage
imagedisplay.style.display = "block"