Thanks nezabudka!

I plugged in your first suggestion and it seems to work just fine! I think I will use that code for now, though I will study your's and other commenters' more compact, elegant solutions later when I have more time: I'm such a neophyte I actually find that the least elegant, most sprawling code is often the easiest for me to understand. Its like learning how clocks work from disassembling one: you want to start with a cheap, simple bedside alarm clock, not a finely crafted rolex!

Again, thank you so much for your help!