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You need to build an array of all the rows in your table and then toggle the display of the last array item to none... Or you can add a class to the row(s) that you want to hide and again build an array of the rows and toggle the display of the row(s) with the className to none.
I say use a class rather than an ID, as it gives you the option to hide (and show) more than one row.
So, unfortunately yes! A script is required!