.Map :: MoHAA Mapping

Thanks guys I figured it out, but it sure would make it easier to "center" the mouse in the brush if I had the middle click lol

in the tutorial on how to manipulate a camera it says to middle click your mouse. I only have a 2 button mouse with a scroll wheel and do not know how to move my camera around. I know this is a VERY noob question but if someone would be kind enough to help an old guy trying his hand at map making I ...