// JavaScript Document
/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Jay Rumsey | http://www.nova.edu/~rumsey/ */

function UpdateCost() {
var pages = document.getElementById('pages').value;
  
  var total_pages = 0;
  var base_total = 0;
  var sum = 0;
  var gn, elem;
  
 if ( document.getElementById('pages_check').checked == true) { 
 	total_pages= Number(document.getElementById('pages').value)*(document.getElementById('pages_check').value) 
 }
 
 
  for (i=0; i<9; i++) {
    gn = 'addition'+i;
    elem = document.getElementById(gn);
    if (elem.checked == true) { sum += Number(elem.value); }
  }
  sub_total=Number(sum)+(total_pages)
  total=Number(sub_total)+(base_total)
  gst=Number(total*0.1)
  final_total=Number(total)+(gst)
  document.getElementById('totalcost').value = total.toFixed(2);
  document.getElementById('the_total').value = final_total.toFixed(2);
}