[jarn]

Use layers to create plots within a browser. Each point to be plotted is rendered via a layer (using the DIV tag). Mozilla/Firefox/IE seem to handle thousands of layers without any problem. Can attach event handler to each point for additional interactivity. Snippet example is housed within a JSP at the location below.

Same technique can be used to create lines between rendered objects on the fly. Compute the equation of a line between two rendered objects. Plot the line point by point and render via div's.

Have fun....
Code source and demo are at
http://www.datacorner.com/coding

click on the jsp for the demo.
click on the txt file and then view source to see the code.

seems to work just fine on IE5.0 or greater / MOZILLA / FIREFOX