[REQ] Wait For Loading Image?

[Myth-X]

Hi

I Was Watching Yahoo! Photos and I noticed that there is a lovely motion circle while the photo is loading and when the image loading completed it's gone.....

and in an arabian forums i found the same move so i wounder how to do it?

is it a hack,product,style mod,????

this is how it looks like:

Thanks For Great Help ​