I declared a truce in another thread, but since you stated you didn't understand my apostrophe comment, I'll explain - not in a mean spirited fashion, but just for clarification, OK?
There is a difference between plural and possessive when it comes to using apostrophes. If you notice, I just used a plural (apostrophes) without using an apostrophe. That's because it's plural, not possessive or a contraction, like the two words, "That's" and "it's" are in this sentence.
In general, you use apostrophes when the word ending in "s" is possessive (i.e.: "Bob's" wiener) or is a contraction (i.e.: "it's" really big, meaning it is really big) but not when the word is just plural, such as in "wieners".
When a word naturally ends in "s" and you want to make it possessive, you put the apostrophe after the "s", which is really kind of weird.
I hope all that is correct, since I don't use a disclaimer in my signature.
Although part of my job in marketing is to write copy, I haven't been to an English class since I graduated college back before dirt was invented.