//this function is called each time the checkout button of the cart is clicked
        function googlecartOnCheckoutClick()
        {
            //get the subtotal value of items in cart
            var subtot = googlecart.getSubtotal();
           
            //get the DOM element with ID of myShipping
            var ship = document.getElementById("myShipping");
            var ship2 = document.getElementById("myShipping2");
			var ship3 = document.getElementById("myShipping3");
           
            //create your own table here - these are just my arbitrary values
     
   
                        //create your own table here - these are just my arbitrary values
            switch (true)
            {
                case (subtot <= 5):
					ship.value = 0.99;
                    ship2.value = 1.99; 
                    ship3.value = 1.99;
                    break;
                case (subtot > 5 && subtot <= 7):
                    ship.value = 0.99;
                    ship2.value = 1.99; 
                    ship3.value = 1.99;
                    break;
                case (subtot > 7 && subtot <= 11):
                    ship.value = 0.99;
                    ship2.value = 1.99; 
                    ship3.value = 1.99;
                    break;
                case (subtot > 11 && subtot <= 20):
                    ship.value = 0.99;
                    ship2.value = 1.99;
                    ship3.value = 2.99;
                    break;
                case (subtot > 20 && subtot <= 35):
                    ship.value = 0.99;
                    ship2.value = 2.99;
                    ship3.value = 2.99; 
                    break;
                case (subtot > 35 && subtot <= 65):
                    ship.value = 0.99;
                    ship2.value = 7.99;
                    ship3.value = 9.99; 
                    break;
                case (subtot > 65 && subtot <= 110):
                    ship.value = 0.99;
                    ship2.value = 9.99; 
                    ship3.value = 14.99;
                    break;
                case (subtot > 110 && subtot <= 200):
                    ship.value = 0.99;
                    ship2.value = 9.99;
                    ship3.value = 19.99;
                    break;
                case (subtot > 200 && subtot <= 400):
                    ship.value = 0.99;
                    ship2.value = 19.99;
                    ship3.value = 39.99;
                    break;
                case (subtot > 400 && subtot <= 600):
                    ship.value = 0.99;
                    ship2.value = 29.99;
                    ship3.value = 49.99;
                    break;
                case (subtot > 600):
                    ship.value = 0.99;
                    ship2.value = 39.99;
                    ship3.value = 59.99;
                    break;
                default:
                    ship.value = 0.99;
                    ship2.value = 39.99;
                    ship3.value = 59.99;
            };
            
            return true;
        }