Split table first and rest

Im trying to split a table into first and rest rows, however my code doesnt seem to pull any rows:-

        function modTable($tableID) {
	        var $firstRow = $('#' + $tableID.id + ' tr:first');
	        var $restRows = $('#' + $tableID.id + ' tr').not(':first');
		}
        modTable($('#myTableID'));

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Any ideas what Im doing wrong?

Thank you in advance