explanationOfScriptInForm_20838502053851

<script type="text/javascript">

    //Each checkbox (targeted by its ID) is placed into an appropriately named variable
    var product1 = document.getElementById("input_1_1001");
    var product2 = document.getElementById("input_1_1002");
    var product3 = document.getElementById("input_1_1003");
    var allProducts = document.getElementById("input_1_1004");

/* The following function is called by the onClick event in the "All Products Discounted" input tag.
It can be interpreted as follows: If the "All Products Discounted" box is checked,
the Product 1, Product 2 and Product 3 boxes become unchecked. ("0" is equivalent to "false") */

    function uncheckOthers() {
        if (allProducts.checked) {
            product1.checked = 0;
            product2.checked = 0;
            product3.checked = 0;
        }
    }

/* The following function is called by the onClick event in the input tag of each of the first three checkboxes.
It can be interpreted as follows: If Product 1 or Product 2 or Product 3 is checked, "All Products Discounted" becomes unchecked. */

    function uncheckDiscount() {
        if (product1.checked || product2.checked || product3.checked) {
            allProducts.checked = 0;
        }
    }

</script>