Connect a usb mp3 player to mixing desk?

I hope I'm posting this in the question in the right place (apologies if not) I have a query which i'd like cleared up.
Up till now we had a CD player wired directly into our now replaced mixer, used for playing our disc during intervals etc, but now we've replaced it with another desk.my question is this...
Can I store the required music on my usb mp3 player/dongle and transfer it directly inot a channel on the desk using something like>

http://www.ebay.ie/itm/USB-Female-3-5mm-aux-1-8-Male-audio-F-M-adapter-jack-Converter-Charge-Cable-/181013340610?pt=UK_MobilePhones_MobilePhoneAccesories_MobilePhoneDataCables_JN&hash=item2a253c61c2#ht_4774wt_989

converting the smaller jack to a larger 3/4 inch jack using something like >

http://www.thomann.de/ie/the_sssnake_1839_adapter.htm

We dont really do much DJ or playing of music off cd so this seems a simple ish way to do it. Can anyone confirm if this will work or if there is a simpler way to do it.

Ah, and this is the desk we are currently using is
http://www.mackie.com/products/cfx12/
thoughts suggestions anyone??
Thanking ye in advance.............