function update_cart_link(id, randomizer) {

	var nvar = (id + randomizer)

	var cart_link = document.getElementById('cart_link' + nvar);

	var selected_color = document.getElementById('shirt_available_colors_' + nvar);
	var selected_size = document.getElementById('shirt_available_sizes_' + nvar);

	var new_link = "/cart/add/" + id + "/" + selected_color.value + "/" + selected_size.value;
	cart_link.href = new_link;


}

function change_shirt_image(shirt_id, color) {

	color = color.toLowerCase();
	shirt_image = document.getElementById('shirt_image_' + shirt_id);
	shirt_image.src = shirt_image.src.replace(/(white|black|red|ash|navy)/, color);

}

function change_checkout(method) {

	checkout_form = document.getElementById('checkout_form');
	checkout_form.action = "/cart/" + method + "_checkout";

}