my imac g5 has a mighty mouse. if you get one of them(they are made by apple), you can go into system prefs and switch it from one mouse button to two. there is a sensor in the mouse that can tell what side of the mouse you are clicking on. it works really good. and for those that can't get runescape to work on your macs, i have no clue what you are doing, because all i did was have to download java and it worked. hope this helps.

You get on the settings on runescape, (the wrench) and click on the mouse, then you can right click. the settings is where the inventory and stuff is

Please spend some money on optical mouse and you can right click just like for any windows system. I too use Logitech optical wireless mouse. :-)