HTML form calculations to have seperate totals for seperate sections in one form

Hi,
I am in charge of setting up an assessment form for a website.  This form has 2 sections where there are checkboxes that hold numeric values.  These values must be added up at the end of each section.
(ie: Section 1: 10 questions - total of the 10 questions shown at the bottom of the section
Section 2: 12 questions - total of section 2 only shown at the bottom of the that section)

Then all form choices and totals to be submitted.

I have a PHP form handler submitting the information and currently I have a .js file processing the calculation in section 1 - but I have no idea how to differentiate the script to process the second calculation of section 2 without including section 1 in the calculations.

Here is the .js I am using as a separate file:

// Calculate the total for items in the form which are selected.
function calculateTotal(inputItem) {
  with (inputItem.form) {
    // Process each of the different input types in the form.
    if (inputItem.type == "radio") {   // Process radio buttons.
      // Subtract the previously selected radio button value from the total.
      calculatedTotal.value = eval(calculatedTotal.value) - eval(previouslySelectedRadioButton.value);
      // Save the current radio selection value.
      previouslySelectedRadioButton.value = eval(inputItem.value);
      // Add the current radio button selection value to the total.
      calculatedTotal.value = eval(calculatedTotal.value) + eval(inputItem.value);
    } else {   // Process check boxes.
      if (inputItem.checked == false) {   // Item was uncheck. Subtract item value from total.
          calculatedTotal.value = eval(calculatedTotal.value) - eval(inputItem.value);
      } else {   // Item was checked. Add the item value to the total.
          calculatedTotal.value = eval(calculatedTotal.value) + eval(inputItem.value);
      }
    }

    // Total value should never be less than 0.
    if (calculatedTotal.value < 0) {
      InitForm();
    }

    // Return total value.
    return(calculatedTotal.value);
  }
}


// This function initialzes all the form elements to default values.
function InitForm() {
  // Reset values on form.
  document.selectionForm.total.value='0';
  document.selectionForm.calculatedTotal.value=0;
  document.selectionForm.previouslySelectedRadioButton.value=0;

  // Set all checkboxes and radio buttons on form to unchecked.
  for (i=0; i < document.selectionForm.elements.length; i++) {
    if (document.selectionForm.elements[i].type == 'checkbox' | document.selectionForm.elements[i].type == 'radio') {
      document.selectionForm.elements[i].checked = false;
    }
  }
}

This script works, but produces an error-not sure why (I'm no genius where JS is concerned), but it calculates it and the total is submitted in the email which is great.  Now I just need to figure how to do a separate one for section 2.

The HTML page is here - if you need the code:
http://www.leveragetosucceed.com/get-help-now-assessment-2-draft.html

Thank you for any help you can give me on this issue.