php generated image in javascript

Question

I have a picture generated with GDLib. In this picture gdlib adds some gif dots in various locations, according to database data.

Now i would like to somehow identify these dots with javascript and make a simple fadein/fadeout function for these dots.

However since its being done with gdlib, i assume the images is interpreted as being just 1 image, and therefore i cannot idetify these dots with JS.

So my question is which technique i should use for this ?

Thanks

Answer 1

Take a picture of a dot and use absolute positioning to put it over the image.