headerPicLeft = function()  {
	var w = $(document).width();
	var nw = '';
	if(w < 1600)  {
		nw = (w - 1600) / 2;
		nw = nw + 'px';
	}
	$('.header_pic_inner').css({marginLeft: nw});
}

$(document).ready(headerPicLeft);
$(window).resize(headerPicLeft);