Animation Continue

Hello,

I'm helping a girlfriend with her graduation project.

I need the following:

A cube, which: turns 90 degrees (horizontal on left mouseclick) (OnMouseOver) turns 90 degrees (vertical on right mouseclick) (OnMouseOver)

I got this setup and working, but when I press left or right mousebutton the animation Resets, instead of continue's after a previous turn on the cube. How can i make it that it continue's as much as desired?

Do i need to do this via Animations, or do you need Vector transform code? If so which one? (I'm still new to programming)

Thanks in Advance