Sorry for being vague. It seems that adding a height of 45 to the main navigation ID solved this problem. Later I discovered that I was not switching over to the blue skin properly, which was causing some other inconsistencies. I eventually just copied all the blue images to the green image folder and changed a few colors in the css. Now the blue is working perfectly. I know this is not the proper way, but it is the only way I could think of to make it work.
In any case, all is well. Thank you for all the great support in this forum. You guys are very responsive.