How to drive two steppers at a same time

Hello. I want to make robot with stepper motors, I have two of them. And I want to drive them at a same time. I tried to put in code first one stepper one step and then another stepper one step. But I have no power if I do like this. Is there another options to do it? Please help me.

Sorry for my bad English I'm from Estonia.

This is a duplicate posting to http://forum.arduino.cc/index.php?topic=203457.0.

Go there to follow the thread!