How to know what power supply is compatible with my motherboard?

i'm about to purchase a new motherboard Gigabyte GA-G41M-COMBO Intel G41 Motherboard - Micro ATX, Socket LGA775, Intel G41, Intel ICH7, DDR3 1333MHz/DDR2 1066MHz, SATAII 3.0Gb/s, 5.1CH Audio, USB 2.0 http://www.circuitcity.com/applications/SearchTools/item-details.asp?EdpNo=6572462&sku=G452-0019 and i have a power supply and i just want to know if it going to work with it http://www.dynexproducts.com/products/computers/DX-400WPS.html