Image Creation

I just wrote a little script to play around with the GD library but I am having a problem displaying it in the browser. I have not problem at all when I just run the script. But I was trying to make the image in a custom function which will return the image when its called. All I end up getting is a bunch of weird characters. Here's my code: function makepie($slice, $total){ $height = 150; $width = 150; $im = ImageCreate($width, $height); $bck = ImageColorAllocate($im, 255,255,255); $black = ImageColorAllocate($im, 0, 0, 0); $red = ImageColorAllocate($im, 255, 0, 0); imagefilledellipse($im, 75, 75, 125, 125, $red); imageellipse($im, 75, 75, 125, 125, $black); //Making the Slice $pieslice = (($slice / $total) * 360) + 315; imagefilledarc($im, 75, 75, 125, 125, 315, $pieslice, $black, IMG_ARC_PIE); //Return header("Content-type: image/png"); echo ImagePNG($im); } Anyone have any idea why I cant return the image? Thanks