Decrease the number of HTTP request to server by decreasing the resources and increasing the overall performance of the website. Few of the method to decrease the resources are by using sprite images or merging JS or CSS files. Here is another one, use base64 data stream of image within your code.
Base64 converts binary data into ASCII string format by translating it into a radix-64 representation (Well that’s too much to know about it). Simply, the base64 technique generates ASCII representation for binary data of image file and browser can parse these ASCII values and render an image on the page.