THEMA:

0;Select A Package;0
0;Basic;1000
0;Premium;1800
0;Ultimate;2500

function ff_packages_action(element, action)
{
ff_packages_fee_action(element, action); 
ff_monthly_fee_main_action(element, action); 
}

function ff_packages_fee_action(element, action)
{
ff_getElementByName('packages_fee').value = Number(ff_getElementByName('packages').value);
ff_total_action(element, action); 
}

0;Package 1;180
0;Package 2;180
0;Package 3;140
0;Package 4;240

function ff_additional_action(element, action)
{
ff_additional_fee_action(element, action);
ff_monthly_fee_additional2_action(element, action);
ff_monthly_fee_additional4_action(element, action);
}

function ff_additional_fee_action(element, action)
{
var a=0;
opts = JQuery("[name=\"ff_nm_additional[]\"]");
for (o = 0; o < opts.length; o++){
if (opts[o].checked){
a = parseInt(a) + parseInt(opts[o].value);
}
}
ff_getElementByName('additional_fee').value = parseInt(a);
ff_total_action(element, action);
}

function ff_total_action(element, action)
{
ff_getElementByName('total').value = Number(ff_getElementByName('packages_fee').value) + Number(ff_getElementByName('additional_fee').value);
}

function ff_monthly_fee_main_action(element, action)
{
var package= JQuery("[name=\"ff_nm_packages[]\"] option:selected").text();
if (package == 'Basic') {
ff_getElementByName('monthly_fee_main').value = 60;
}
else if (package == 'Premium') {
ff_getElementByName('monthly_fee_main').value = 60;
}
else if (package == 'Ultimate') {
ff_getElementByName('monthly_fee_main').value = 60;
}
else {
ff_getElementByName('monthly_fee_main').value = 0;
}
ff_total_monthly_fee_action(element, action);
}

function ff_monthly_fee_additional2_action(element, action)
{
    switch (action)
     {
          case 'change':
          vals = '';
          opts = JQuery("[name=\"ff_nm_additional[]\"]");
          if (opts[1].checked){
              ff_getElementByName('monthly_fee_additional2').value = 20;
              bfToggleFields('on','element','monthly_fee_additional2',bfDeactivateField);
          }
          else{
             ff_getElementByName('monthly_fee_additional2').value = "";
             bfToggleFields('off','element','monthly_fee_additional2',bfDeactivateField);
          }
      }
ff_total_monthly_fee_action(element, action);
}

function ff_monthly_fee_additional4_action(element, action)
{
    switch (action)
     {
          case 'change':
          vals = '';
          opts = JQuery("[name=\"ff_nm_additional[]\"]");
          if (opts[3].checked){
              ff_getElementByName('monthly_fee_additional4').value = 60;
              bfToggleFields('on','element','monthly_fee_additional4',bfDeactivateField);
          }
          else{
             ff_getElementByName('monthly_fee_additional4').value = "";
             bfToggleFields('off','element','monthly_fee_additional4',bfDeactivateField);
          }
      }
ff_total_monthly_fee_action(element, action);
}

turn on element mydummy if yourdummy is something

function ff_total_monthly_fee_action(element, action)
{
ff_getElementByName('total_monthly_fee').value = Number(ff_getElementByName('monthly_fee_main').value) +Number(ff_getElementByName('monthly_fee_additional2').value) + Number(ff_getElementByName('monthly_fee_additional4').value);
}