function add_to_cart(product_id)
{
	if (document.getElementById('quantity'+product_id))
	 {
		var quantity = 1*document.getElementById('quantity'+product_id).value;
	 } else {
		var quantity = 1;
	 }
	var color_id = document.getElementById('color_id'+product_id).options[document.getElementById('color_id'+product_id).selectedIndex].value;
	document.forms['add_product_form'].elements['product_id'].value = product_id;
	document.forms['add_product_form'].elements['product_color'].value = color_id;
	document.forms['add_product_form'].elements['product_quantity'].value = quantity;
	document.forms['add_product_form'].submit();
}