bought a PSU and im wondering if itll fit in my mini ATX

bought a PSU and im wondering if itll fit in my micni ATX.... i have a HP a1600n with a 7900 GS 2 gigs ram and its a mini ATX tower and i bought this PSU..http://www.newegg.com/Product/Product.aspx?Item=N82E16817189014wondering if it will fit inside of my tower if im creative enough n stuff or was it a bad buy....site for the a1600n.....http://h10025.www1.hp.com/ewfrf/wc/prodinfoCategory?lc=en%26cc=us%26dlc=en%26product=3245022%26lang=en