Sorting and alternating row colors

My table's rows are not keeping the alternating colors when sorting. Actually when the table appears the rows aren't even correct. There must be something with my table causing this, but I am just not seeing it.

As per http://datatables.net/forums/discussion/13102/soring-break-row-color-background/p1 the alternating row colors are just supposed to work.

Here is an example:
http://live.datatables.net/ukeqoc/edit#javascript,html,live

Any help is appreciated.

Thanks,
Chris