How To Add more banner display groups?

This has been very helpful....my final problem is I can not for the life of me get it to go where I want it to!!!! I have worked in tpl_mainpage A LOT and I can get it to show up, but not where I want.
this is the site: squishy tushy .com and I want it under the Rate Us sidebox on the left OR on the bottom right under the testimonials. I can get it to show up at the top of either column I can't move it down.

Thanks for any help!

How would I apply a new banner group to the specials page, I tried this to supress the banner group 1 on the specials page but it is not working

if (SHOW_BANNERS_GROUP_SET1 != '' && $_GET['main_page'] != 'specials' && $banner = zen_banner_exists('dynamic', SHOW_BANNERS_GROUP_SET1)) {
if ($banner->RecordCount() > 0) {
?>

Thanks so much for this. i have been looking everywhere for this! :-D