Re: Scaling way down
[quote="jerryb":uahuky6p]now if all you want to do is just change the dpi and not the pixal deminsions... then uncheck the resample box ......!! see if that works for you.....[/quote:uahuky6p] He's already said he wants to scale down to 30px and 72ppi - I think that rules out this option.
Rogertb, when you're making images for the web it's best to create them at the actual size you want, instead of creating them way too big and then resizing. For the best results I'd advise you to go back to the drawing board an create your button at 30px. If you can't do this then you'll have to touch up your resized button manually or look for a reducing plugin that will do a better job of it than Photoshop. 