For example, I have a picture of a black star on a white background. I will be using jquery to make it so that the user can drag this star around. However, how can I make it so that the white background color is technically transparent? I don't want the image to be transparent- only the images white background color. I want it to be transparent so the user can drag it over other colored divs without noticing that the background exists.

Is this possible to do?