gif vs png using gd

Hey folks, I've been experimenting with creating some graphics on the fly with GD. So far, so good. However, I've switched ISP's, and their gd doesn't support gifs. I've tried changing the header syntax header("content-Type: image/gif") to header("content-Type: image/png"); and the imagegif to imagepng, and all I get when I try to view the image is a broken quicktime icon. Is there some browser setting I need to change? Thanks in advance, Kelly ----------------------------------------------------------- This message was sent using Crocker Communications WebMail. https://webmail.crocker.com/