Either Hyla chrysoscelis or Hyla versicolor. They are usually very green when they first come onto land. See Frog Forum - Gray Tree Frog Care and Breeding for more info and some froglet pictures. You apparently have both types of Grays in NJ, http://amphibiaweb.org/cgi/amphib_qu...-state_code=NJ, and they are visually impossible to distinguish.
In the future please start a new thread of your own, as reviving a 2-year old one can cause some confusion.