function window_resize()
{
	var window_width=document.documentElement.clientWidth;

	if(window_width<"1101"){document.getElementById('shapka_img').style.background="#155920 url('/images/header_1024.jpg') no-repeat top center";}
	if(window_width>"1100"){document.getElementById('shapka_img').style.background="#155920 url('/images/header_1280.jpg') no-repeat top center";}
	
	setTimeout("window_resize()",500);
}

(new Image(1120,327)).src = '/images/header_1024.jpg';
(new Image(1330,327)).src = '/images/header_1280.jpg';
window_resize();