PaulS:
NewPing (12, 11, MAX_DISTANCE) , //Get rid of the useless comments. Have you seen any examples where statements end with commas?
And repost your code using code tags, the # button above the input box. That way you'll not have some of it in italics and not have o as a variable. Also, it would be a good idea if you hit Ctrl + t in the IDE, to format your code properly, before posting it. That will tell you what some of your errors are.