could you please tell me what size mouse i should be feeding my corn snake here are some pictures of him http://tinypic.com/view/?pic=dvg1s6
http://tinypic.com/view/?pic=dvg3lh

really doesnt help with sizeing him.

I prey item that is equal in girth to the thickest part of the snake would be the right size.

Can't tell much from the pics. Put a ruler down next to him so we can get an idea of his size. Snakes can get down surprisingly large prey items. The mouse should be about 1.5 times the size around of your snake. So after he has eaten, you see an obvious bulge. If the bulge is only just noticeable, then the mouse was too small. Also, your snake doesn't look more than 6 months old, so you should feed every 4 to 5 days. When my snake was 15 inches long, he was eating 2 pinkies every 4 days. He was on those for about a month and a half and then went to 1 fuzzy. After that, he moved up in mouse size about every 2 months, still feeding him every 4 days until he went to hoppers, then every 5 days. Now that he is on adults, I feed him every 6 days.

He is between 30cm and 37cm long and between 2cm 3cm wide

You should feed your snake 1 pinkie every 4 days. If he is closer to the 37cm than 30cm, then you could try 2 pinkies every 4 days. If my snake got the first mouse down really quick, like 2 to 3 minutes, I would give him another. If your snake takes a little while to get his mouse down, then probably just one. If he has an obvious bulge after one, leave it at that. Also, feeding mice that you buy frozen and then thaw yourself is better (in my opinion) than feeding your snake a live mouse. Live mice could hurt your snake, have parasites, or other undesirable passengers. Freezing takes care of those possible problems.

Thankyou for your help

Glad I had the info you needed. We're all here to help each other.