function CalculateTotal(frm) {
    var order_total = 0

    for (var i=0; i < frm.elements.length; ++i) {

        form_field = frm.elements[i]

        form_name = form_field.name

        if (form_name.substring(0,4) == "Item") {

            item_price = parseFloat(form_name.substring(form_name.lastIndexOf("_") + 1))

            item_quantity = parseInt(form_field.value)

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


    frm.TOTAL.value = round_decimals(order_total, 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) {

    var value_string = rounded_value.toString()
    
    var decimal_location = value_string.indexOf(".")

    if (decimal_location == -1) {
        
        decimal_part_length = 0
        
        value_string += decimal_places > 0 ? "." : ""
    }
    else {

        decimal_part_length = value_string.length - decimal_location - 1
    }
    
    var pad_total = decimal_places - decimal_part_length
    
    if (pad_total > 0) {
        
        for (var counter = 1; counter <= pad_total; counter++) 
            value_string += "0"
        }
    return value_string
}