Multiple character animations

Hi there, I want to ask, if someone can tell me how can I create a multiple character animations.. I mean, I have a character with running animation, walking, etc. and then I have animation only for the upper body part (hands, head, ..) I want to achive, that my character will be running, then I click mouse and upper body of my character will do some action (attack for example) and after that animation it will return to running animation..

I was trying to achive that earlier, but the only way I find out was, that my character was splited to two parts. Upper body and lower body. When character was running, upper and lower body has run animation on it, then I clicked, upper body hid (turned of renderer) and other upper body with attack animation has appeared. When animation was over, running body has appeared again.

If you know some better solution, withou using mecanim, help me please.

Thanks, Marshall.