Karen,
Thanks for your input. When the students know you are available and ready to help them, you begin to develop a good community in the class. After the community builds and a relationship is established, the trust is developed. It must be difficult keeping up with the 4 hour window, but I don't know how many students you may have in the course. When I had 220 in one course, I was barely able to keep up with the 24 hour window initially. Keep up the great work. Thanks again.