function setStyle()
		{
			switch(screen.width)
				{
				case 1024:
				  document.body.style.background="#000 url(bg1024.jpg) no-repeat fixed center center";
				  break;    
				case 1280:
				  document.body.style.background="#000 url(bg1280.jpg) no-repeat fixed center center";
				  break;
				default:
				  document.body.style.background="#000 url(bg1600.jpg) no-repeat fixed center center";
				}
		}