[Javascript] form query

[Frank Davie]

Dear Javascript List,
I am teaching myself javascripting and have decided to tackle this form menu, I have to display the totals, days,and email confirm.
The only thing is I cannot get the script far enough to calculate the total, I get an error message saying product.length is null or not an object.
Could you possibly give me a solution to calculate and display the subtotal and total so I can move on to the days and email calcs.

thanks

p.s 

I have enclosed the form 




function calc(f){  
 var qty = new Array();
 var subtotal;
 
 var total = 0;
 var i = 0;
 var num= 1;

 while ( num !=0 && i < product.length) {
  qty[i] = num;
               subtotal = subtotal + qty[i] * prices[i]
  
 
 
                                               }

                        }
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