Read the "How to use this forum" sticky at the top of the forum that tells you how to post code correctly in</> code tags.
Then use your new knowledge to show us your current code that sweeps 2 servos together and we'll fix it to sweep in opposite directions. But it's often as simple as - if you're now doing write(x) to both servos you need to change one of them to write(180-x).
Steve