The only way of doing it is to use the RRD files that store the data and create your own pages with graphs. All we use to store the data is a standard RRD file and if you’d like code to read those files and display graphs I can post it here but it’ll still take some work to get what you want shown on a given page.
It’s been a while and I almost forgot about this thread… If I can’t get the code for it, how hard would it be to take the code from Cacti or NetMRG and modify it to do what I want?