https://cpk.si/js/jquery.fullbg.js

1/**
2 * jQuery.fullBg
3 * Version 1.0
4 * Copyright (c) 2010 c.bavota - http://bavotasan.com
5 * Dual licensed under MIT and GPL.
6 * Date: 02/23/2010
7**/
8(function($) {
9	$.fn.fullBg = function(){
10		var bgImg = $(this);
11		
12		bgImg.addClass('fullBg');
13		
14		function resizeImg() {
15			var imgwidth = bgImg.width();
16			var imgheight = bgImg.height();
17			
18			var winwidth = $(window).width();
19			var winheight = $(window).height();
20				
21			var widthratio = winwidth/imgwidth;
22			var heightratio = winheight/imgheight;
23			
24			var widthdiff = heightratio*imgwidth;
25			var heightdiff = widthratio*imgheight;
26			
27			if(heightdiff>winheight) {
28				bgImg.css({
29					width: winwidth+'px',
30					height: heightdiff+'px'
31				});
32			} else {
33				bgImg.css({
34					width: widthdiff+'px',
35					height: winheight+'px'
36				});		
37			}
38		} 
39		resizeImg();
40		$(window).resize(function() {
41			resizeImg();
42		}); 
43	};
44})(jQuery)