How can i write asp.net 4.0 image handler for serving images from a cookieless domain

Question

How can i write asp.net 4.0 image handler for serving images from a cookieless domain

i created a cookieless subdomain

but the problem is i dont want to change my all source code

instead i want to write handler to process all

.jpg , .png and .gif files to that domain

how can i do that at

microsoft visual studio 2010 , asp.net 4.0 , iis 7.5

thank you