使用AWS中静态文件夹中的项创建Sprite图像

I have a static folder with images in an AWS Server and I need to create (and update) a sprite image every time when I send a Image to the server(via FTP), and save it's positions in JSON to send to a web service. Actually, I load these images with Ajax called with Jquery in a Django Project, who works usually in Internet Explorer and because this, it loads slowly and some imagens dont load always, and the user need to refresh the page. Anyone have a suggestion how to create the sprite?I have a static folder with images in an AWS Se