Cisco 280011

Remote control a computer over internet behind Cisco & Broadband router

My wan/lan scenario is graphically presented in this snap (http://www.picscrazy.com/view/dxxu )  So far using static IP I’m able to telnet (over internet) my cisco 2611 router which is behind NAT supported broadband router but what should I do to connect remotely using Realvnc or similar tool...