$(document).ready(function() {
	$('ul#product-nav').each(function () {
		var maxwidth = $(this).innerWidth();
		var childwidth = 0;
		$('li',this).each(function() {
			childwidth = childwidth+$(this).outerWidth()-20;
		});
		var margin = maxwidth-childwidth-20;
		$(this).css('margin-right',margin);
	});
});