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Unity Neural Networks for character recognition question

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Hi, I have finally developed a neural network that works ok but there are still some issues and it needs tweaking. I am trying to recognize handwritten numbers 0 to 9. I am passing it images of numbers. I resize the numbers by finding the top, left, bottom, and right edges and then stretching them to meet a 15 x 15 pixel bmp. The bmp is then fed into the network (20*15 = 300 input nodes, 500 hidden nodes, and 10 output). It works ok but I kind of just pulled the 500 hidden nodes out of nowhere. How many hidden nodes should I have for this network? What other teaks should I have? The network is having difficulty with recognizing 9's (sometimes confuses for 4's) and 8's I made the same post in the AI forum but that forum is more for game AI. Here's the link http://www.gamedev.net/community/forums/topic.asp?topic_id=367058

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