Shalom Sarah! I never would have thought to use paper behind it. I had no idea what stabilzer was before you guys were gracious enough to help me out with these tips!
About your question, the Challah cover has three Hebrew letters, from right to left, Shin Bet Tav (SH B T in English), which is"shabbat" or " rest"*ahh* There are only three letters because they have no written vowels. Interesting huh? If you'd like to learn more, you can check out my Ning Network...no members yet, but it has lots of interesting things about the roots of our faith. The address is: http://yeshuanetwork.ning.com/ Have a wonderful day, Sarah!