My question is while developing any web site i use many images stop, next, back, prev for doing some stuff, i put them in different folder and access them separately. But when i see other web site and try to get the images like reply, post , Search so that i can use them for my site or use the color combination the way they have use. What i see is, i get many images in one png image. I want to ask is what is purpose of putting all images in one PNG image and while accessing one image from there how they access that particular image from those images. If any one can provide some code then it will be very great and also the advantages and disadvantages.
Thanks in advance.