// JavaScript Document
$(function() {   
	var theWindow        = $(window),
		$bg              = $("#bg"),
	    aspectRatio      = $bg.width() / $bg.height();
			    			    		
		function resizeBg() {
			if ( (theWindow.width() / theWindow.height()) < aspectRatio ) {
			    $bg
			    	.removeClass()
			    	.addClass('bgwidth');
			} else {
			    $bg
			    	.removeClass()
			    	.addClass('bgwidth');
			}			
		}	                   			
		theWindow.resize(function() {
			resizeBg();
		}).trigger("resize");
		
});