Hi

I have the following coding in my website that add's or remove's prices to a quote page and works perfect but I need to insert another input field that takes the order total and divides it by 2

Just wondering how I do that in this coding

Below is the HTML

HTML Code:
<form name="checkbox">
        
        One Page<input type="checkbox" name="PROD_CH_70.00" value="70" onchange="CalculateTotal(this.form)">
        <br>
        Two Pages<input type="checkbox" name="PROD_CH_140.00" value="140" onchange="CalculateTotal(this.form)">
        <br>
        Three Pages(Bronze Package)<input type="checkbox" name="PROD_CH_179.00" value="179" onchange="CalculateTotal(this.form)">
        <br>
        Six Pages(Silver Package)<input type="checkbox" name="PROD_CH_339.00" value="339" onchange="CalculateTotal(this.form)">
        <br>
        Ten Pages(Gold Package)<input type="checkbox" name="PROD_CH_549.00" value="549" onchange="CalculateTotal(this.form)">
        <br>
        New Business Start up<input type="checkbox" name="PROD_CH_289.00" value="289" onchange="CalculateTotal(this.form)">
        <br>
        Ecommerce Package<input type="checkbox" name="PROD_CH_449.00" value="449" onchange="CalculateTotal(this.form)">
        <br>
        SEO on all pages<input type="checkbox" name="PROD_CH_30.00" value="449" onchange="CalculateTotal(this.form)">
        <br>
        Logo Design<input type="checkbox" name="PROD_CH_25.00" value="25" onchange="CalculateTotal(this.form)">
        
 <!--<input type="text" name="PROD_DC_15" size="10" maxlength="3" onchange="CalculateTotal(this.form)">
<input type="text" name="PROD_CC_20" size="10" maxlength="3" onchange="CalculateTotal(this.form)">-->
<br><br>
<span style="color: #FFFFFF;"><input type="text" name="TOTAL" size="10" onfocus="this.form.elements[0].focus()
">  
</span>
</form>
Below is the Javascript coding

Code:
function CalculateTotal(frm) {
        var order_total = 0


        // Run through all the form fields
        for (var i=0; i < frm.elements.length; ++i) {


                // Get the current field
                form_field = frm.elements[i]


                // Get the field's name
                form_name = form_field.name


                // Is it a "product" field?
                if (form_name.substring(0,4) == "PROD") {


                        // If so, extract the price from the name
                        item_price = parseFloat(form_name.substring(form_name.lastIndexOf("_") + 1))


                        // Get the quantity
                        if(form_field.type == 'checkbox') {
                                item_quantity = form_field.checked;
                        } else {
                                item_quantity = parseInt(form_field.value);                
                        }


                        // Update the order total
                        if (item_quantity >= 0) {
                                order_total += item_quantity * item_price
                
                 


                        }
                }
        }


        // Display the total rounded to two decimal places
        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) {


        // 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
        }