Originally Posted by fumblies

I was wondering, how do I get rid of jagged edges in an image with a transparent background?
I've tried saving for web (in photoshop) in both .gif and .png but the irritating jagged edges does not seem to be disappearing. Help?

Edit: I just realised that the jagged edges is more obvious when viewed on my pc laptop compared to my macbook. Is there a way to minimise the difference?