Whiteboard in Flash/Java

Hi there, I need to create a whiteboard that uses flash or java tecnology (don´t know wich one could be better) to put on-line, it´s for teaching purposes. I had download a simple but powerful flash whiteboard to be used a base for this job. The programmer will need to do some adjustments and changes to this whiteboard, specially to be able to paste pictures on it and to be able to see small slides on the side as a preview of the coming slides.