background

var bg= "http://i25.servimg.com/u/f25/14/15/79/51/i_back11.jpg"; if(screen.width < 801) bg="http://i25.servimg.com/u/f25/14/15/79/51/i_back12.jpg"; else if(screen.width < 1025) bg="http://i25.servimg.com/u/f25/14/15/79/51/i_back13.jpg"; else if(screen.width < 1281) bg="http://i25.servimg.com/u/f25/14/15/79/51/i_back14.jpg"; else if(screen.width < 1601) bg="http://i25.servimg.com/u/f25/14/15/79/51/i_back15.jpg"; document.body.style.backgroundImage="url("+bg+")";