I have been tasked (read: family slave labor) to install a relay rack to house the equipment for a small business in a new building. We are brining in all the phone (CAT3), network (CAT6), video (RG6), and surveillance (RG59+power) cables (PIC) into one small room. I believe I have all the equipment necessary except for one thing. I would like to brace the top of the relay rack to the rear wall to ensure stability. None of the dealers of rack equipment that I have visited seem to have anything for that purpose, yet I see pictures (ala the Networking Gallery) showing this to be a standard practice. Can someone provide a recommendation or point me towards some references for such a project? Are there any obstacles I should be aware of?