/**
 * jQuery.fullBg
 * Version 1.0
 * Copyright (c) 2010 c.bavota - http://bavotasan.com
 * Dual licensed under MIT and GPL.
 * Date: 02/23/2010
**/
(function($) {
	$.fn.fullBg = function(){
		var bgImg = $(this);
		
		bgImg.addClass('fullBg');
		
		function resizeImg() {
			var imgwidth = bgImg.width();
			var imgheight = bgImg.height();

			var winwidth = $(window).width();
			var winheight = $(window).height();

			var widthratio = winwidth/imgwidth;
			var heightratio = winheight/imgheight;
			
			var widthdiff = heightratio*imgwidth;
			var heightdiff = widthratio*imgheight;

			if(heightdiff>winheight) {
				var offset = (winheight-heightdiff)/2;
				bgImg.css({
					top: offset+'px',
					width: winwidth+'px',
					height: heightdiff+'px'
				});
			} else {
				var offset = (winwidth-widthdiff)/2;
				bgImg.css({
					left: offset+'px',
					width: widthdiff+'px',
					height: winheight+'px'
				});
			}
		} 
		resizeImg();
		$(window).resize(function() {
			resizeImg();
		}); 
	};
})(jQuery)