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Whenever significant during the holiday season, the major mainstream Home will put festive costumes, designers typically use a substantial background pictures to get a better visual impact, of course, also taking into account that some users are not accustomed to this great background, then place the "Close" button in the background is necessary, users simply click on the "Close background" button, a substantial background image will disappear.
We use javascript to control the background image to show and hide, when you click the close button, so that the page does not load control CSS background image while recording COOKIE parameters and set the cookie is valid, then refresh the page in the cookie is valid, is not reloading background, and if the cookie fails, the background image will reload.