1 switch for 2 windows?

[J-440]

Am wanting to use my power window switch to roll up/down my 1/4 windows at the same time. I'm using Electric Life's BMW switch kit. The switch has 6 terminals. I've hooked the switch up correctly and have just spliced and wired the motor wires to the same terminals. Obviously this won't work because both windows will only move 1/2" and they both stop. Is there a relay or some kind of item I need that will go between the motors and the switch to send more "juice" to raise the windows at the same time? My wiring skills aren't that great so I'll need a schematic or a very patient member on this board to walk me through this. Or if someone's already done this, show me his/her website. Thanks again.