/* label products 1 - 10 for all groups */
$("#productGroupA ul > :nth-child(1), #productGroupB ul > :nth-child(1), #productGroupC ul > :nth-child(1), #productGroupD ul > :nth-child(1)").addClass("prod1");
$("#productGroupA ul > :nth-child(2), #productGroupB ul > :nth-child(2), #productGroupC ul > :nth-child(2), #productGroupD ul > :nth-child(2)").addClass("prod2");
$("#productGroupA ul > :nth-child(3), #productGroupB ul > :nth-child(3), #productGroupC ul > :nth-child(3), #productGroupD ul > :nth-child(3)").addClass("prod3");
$("#productGroupA ul > :nth-child(4), #productGroupB ul > :nth-child(4), #productGroupC ul > :nth-child(4), #productGroupD ul > :nth-child(4)").addClass("prod4");
$("#productGroupA ul > :nth-child(5), #productGroupB ul > :nth-child(5), #productGroupC ul > :nth-child(5), #productGroupD ul > :nth-child(5)").addClass("prod5");
$("#productGroupA ul > :nth-child(6), #productGroupB ul > :nth-child(6), #productGroupC ul > :nth-child(6), #productGroupD ul > :nth-child(6)").addClass("prod6");
$("#productGroupA ul > :nth-child(7), #productGroupB ul > :nth-child(7), #productGroupC ul > :nth-child(7), #productGroupD ul > :nth-child(7)").addClass("prod7");
$("#productGroupA ul > :nth-child(8), #productGroupB ul > :nth-child(8), #productGroupC ul > :nth-child(8), #productGroupD ul > :nth-child(8)").addClass("prod8");
$("#productGroupA ul > :nth-child(9), #productGroupB ul > :nth-child(9), #productGroupC ul > :nth-child(9), #productGroupD ul > :nth-child(9)").addClass("prod9");
$("#productGroupA ul > :nth-child(10), #productGroupB ul > :nth-child(10), #productGroupC ul > :nth-child(10), #productGroupD ul > :nth-child(10)").addClass("prod10");

/* label every third product starting with the first for all groups */
$("#productGroupA ul > :nth-child(3n+1), #productGroupB ul > :nth-child(3n+1), #productGroupC ul > :nth-child(3n+1), #productGroupD ul > :nth-child(3n+1)").addClass("everyThird");