Hi Folks!! floydd, you flatter me more than I deserve. There's a good bit of stuff out there--lemme give it some thought for a day or so. The timing of your question is actually good 'cause I'm researching that sort of stuff for fall classes. I'll post an answer here at the Forum or you can converse with me directly. My e-mail is DrZik@aol.com Peter (Dr. Zik)