JQuery - 将背景图像设置为图像对象

I new to JQuery and I am trying to do a proof-of-concept with it. I am trying to use JQuery to: 1) Download a large (>500kb) image file 2) Set the image as the background of an element when downloaded 3) fade it in (basically the way that Bing.com does it). The StackOverflow community has generously helped me most of the way through this problem as shown I new to JQuery and I am trying to do a proof-o