jquery - Sum checkboxes and select options together -

i hoping add values of multiple select options , checkboxes using jquery have got little stuck. primary issue receive nan combined answer.

i summed dropdowns worked (an example can found @ http://pure.evolvedublin.com/phone) need add checkboxes mix (as seen @ http://pure.evolvedublin.com/broadband-phone).

when click start button on both pages, values become available.

i have tried using solutions found in jquery checkbox , select - sum values , add in var , jquery update initial price on click on checkbox has data-price attribute have not been able them working.

my jsfiddle sample of code here: http://jsfiddle.net/damienoneill2001/77hhd/

i using following code add checkboxes, dont have right:

jquery('input:checkbox').change(function(){     tot=0;     jquery('input:checkbox:checked').each(function(){     tot+=parsefloat(jquery(this).val()); }); tot+=parsefloat(document.getelementbyid("broadband_package").value)+parsefloat(document.getelementbyid("irish_mobile_package").value)+parsefloat(document.getelementbyid("intl_landline_package").value)+parsefloat(document.getelementbyid("intl_mob_package").value);     jquery('.cost-container').text(tot);     jquery('.cost-containerb').val(tot); });  jquery('.broad .irish_mob').change(function(){     jquery('input:checkbox').trigger('change'); }); 

the values should add total when add button pressed.

can see going wrong?

the following values return undefined when first check something:

document.getelementbyid("intl_landline_package").value document.getelementbyid("intl_mob_package").value 

this because these divs, not selects, value undefined. need loop through checkboxes in these divs , add values individually.