inserting a bitmap into an Image

Does anyone know how to put a bitmap into an Image? I need to have a filled circle in a graph. This shouldn't be a problem except we have an older version of GD (and our network guy is overworked so it would take a few weeks to get a newer version installed) and the graph has gridlines. If I make a circle and then fill it it will fill up to a gridline but leave the rest of the circle empty. I was hoping to get a filled circle file and use that in my Image but I can't find anything on PHP.net. I'd really appreciate any ideas you might have! Thanks! -Natalie Natalie S. Leotta Information Management Services, Inc. (301) 680-9770 LeottaN@ims.nci.nih.gov