$(document).ready(function () {
	$.fn.full_bg(Options);
});
(function ($) {
	$.fn.full_bg = function (options) {
		var def_options = {
			width: 1280,
			height: 638
		};
		var options = $.extend({}, def_options, options);
		$(document).ready(function () {
			$(options.bgID).full_bgResize(options);
		});
		$(window).bind("resize", function () {
			$(options.bgID).full_bgResize(options);
		});
		return this;
	};
	$.fn.full_bgResize = function (options) {
		var f_ = $('.bottom-line').height();
		var ratio = options.height / options.width;
		var browser_width = $(window).width();
		var browser_height = $(window).height() - f_;
		if ((browser_height / browser_width) > ratio) {
			$(this).height(browser_height);
			$(this).width(browser_height / ratio);
		} else {
			$(this).width(browser_width);
			$(this).height(browser_width * ratio);
		}
		$(this).css('left', (browser_width - $(this).width()) / 2);
		$(this).css('top', (browser_height - $(this).height()) / 2 + 40);
		return this;
	};
})($);
var Options = {
	width: 1280,
	height: 638,
	bgID: '#bg-box img'
};