function updateTotal(frm, prices) {
    var order_total = 0;

    // Run through all the form fields
   	$("input[name^=PROD_]", frm).each(function () {
		// extract the id from the name
		var matches = this.name.match(/PROD_(.*)$/);
		var id = matches[1];

		item_price = parseFloat(prices[id]);
		item_quantity = parseInt(this.value);

		if (item_quantity > 0) {
			order_total += item_quantity * item_price;
		}
    });

    // Display the total rounded to two decimal places
    frm.TOTAL.value = order_total.toFixed(2);
}

function round_decimals(original_number, decimals) {
    var result1 = original_number * Math.pow(10, decimals)
    var result2 = Math.round(result1)
    var result3 = result2 / Math.pow(10, decimals)
    return pad_with_zeros(result3, decimals)
}

function pad_with_zeros(rounded_value, decimal_places) {
    // Convert the number to a string
    var value_string = rounded_value.toString()
    // Locate the decimal point
    var decimal_location = value_string.indexOf(".")
    // Is there a decimal point?
    if (decimal_location == -1) {
        // If no, then all decimal places will be padded with 0s
        decimal_part_length = 0
        // If decimal_places is greater than zero, tack on a decimal point
        value_string += decimal_places > 0 ? "." : ""
    }
    else {
        // If yes, then only the extra decimal places will be padded with 0s
        decimal_part_length = value_string.length - decimal_location - 1
    }
    // Calculate the number of decimal places that need to be padded with 0s
    var pad_total = decimal_places - decimal_part_length
    if (pad_total > 0) {
        // Pad the string with 0s
        for (var counter = 1; counter <= pad_total; counter++)
            value_string += "0"
        }
    return value_string
}

function checkOrderForm(form) {
	var errors = '';
	var numErrors = 0;
	var TOTAL = form.TOTAL.value;
	if ((TOTAL=='')||(TOTAL==0)||(TOTAL==0.00)) {
		errors += '- You did not select any Wines.\n';
		numErrors++;
	}

	if (numErrors) {
		errors = 'The form was not submitted due to the following problem' + ((numErrors > 1) ? 's' : '') + ':\n\n' + errors + '\nPlease fix ' + ((numErrors > 1) ? 'these' : 'this') + ' problem' + ((numErrors > 1) ? 's' : '') + ' and resubmit the form.';
		alert(errors);
		return false;
	}
	return true;
}