$(document).ready(function() {
	$("select.merch_size_item").change(function () {

		var itemID = $(this).attr("id");
		var bnA = "#buy_now_" + itemID;
		var atcA = "#add_to_cart_" + itemID;
		
		var selOpt = "#" + itemID + " option:selected";
		var str = $(selOpt).text();

		var bn = $(bnA).attr("href");
		bn = bn + '&on0=Size&os0=' + str;
		$(bnA).attr({href: bn});
		
		var atc = $(atcA).attr("href");
		atc = atc + '&on0=Size&os0=' + str;
		$(atcA).attr({href: atc});
	});
 });