[Rails] Conditional background color of rows

Hi,

I am using dataTables to render my content onto a view. I need to change the background color of a row depending upon ratio of values of two columns. How shall I proceed. I went through following page on dataTables website but it didn't work for me.

   http://www.datatables.net/examples/advanced_init/row_callback.html

Regards,
Sumit

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