Where can i download instant messanger for my plam centro?

Me and my sister both bought palm centros. but mine came with a different instant messenger than hers. i want to get the version she has because it works much better and faster. we timed it. hers takes an average of 3-7 seconds to recieve a message. for some reason mine takes 30-35. she has version 1.3.76.s and its made by OZ communications Inc. please help me. i need to know where i can download this version