I have been thinking about getting shower chairs four our bathroom, we dont have a no-slip bathroom rug yet but I guess this will be much better:

This is a bath safe adjustable shower seat that can support up to 300lbs (not that we will ever have a 300 lbs person in the house!) and the backs and arms are removable too. Martha will like this. I saw this at AllegroMedical.com. Allegro Medical is one of the largest and most technologically advanced independently owned online retailers of life enhancing products in the United States. Since launching the first ecommerce site in the medical equipment and home health care supplies industry in 1998, Allegro has expanded to include mainstream consumer retail products such as Exercise & Fitness Equipment, Nutritional Dietary Supplements, Maternity/Baby Supplies and Outdoor Gear.