Lazy pre-Backstretch Backstretch

stretcher.js

$(window).resize(function(evt){
			var imgDim = [ $("img#homepage-image").width(), $("img#homepage-image").height() ];
			var bodyDim = [ $(document.body).width(), $(document.body).height() ];
			$("#homepage-image-wrapper").width(bodyDim[0]).height(bodyDim[1]);
			
			var widthRatio = imgDim[0]/bodyDim[0];
			var heightRatio = imgDim[1]/bodyDim[1];

			if( widthRatio > heightRatio ) {
				$("img#homepage-image").height(bodyDim[1]).width(imgDim[0]/heightRatio);
			} else {
				$("img#homepage-image").width(bodyDim[0]).height(imgDim[1]/widthRatio);
			}
		});