Set thumb-image in Javascript

set-cropped-image.js

setThumbImage = function(e, src) {
	var img = new Image();
	img.src = src;
	img.onload = function() {
		console.log("img loaded");
		e.style.backgroundImage = 'url('+src+')';
		e.style.backgroundPosition = 'center';
		e.style.backgroundRepeat = 'no-repeat'; 
		e.style.backgroundSize = (img.width>img.height ? 'auto 100%' : '100% auto');  
	}
}