We are building a online gradebook system for teachers and one of the
most important aspects is entering grades into a spreadsheet-like
structure.  The teachers need to see a students running average and my
first thought was to build an HTML table and have Javascript do some
calculations on the fly.  These results do not have to be written back
to the database, just displayed in the table.

Since we are using Ruby on Rails and it is using Prototype &
script.aculo.us I thought you guys might be able to help us.  I don't
think this is really too complex but I'm not much of a Javascript guy
and would like to know the "best" way of doing something like this.
If there is something already built-in to these two frameworks, even
better!

Thanx!
  Richard

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