var customer={

name:' firstname lastname',

email: 'example@domain.com',

company: "company name",

phone_number: 'phone number',

};

var product_codes=['alpha', 'beta', 'gamma'];

quantities=[23, 56, 45];

​

var yourLink = document.getElementById("thelink");

yourLink.onclick = function() {

       var elf = "%0A"; //Encoded Line Feed

       mailtoBody = "Name: " + customer.name + elf

                  + "Email: " + customer.email + elf

                  + "Company Name: " + customer.company + elf

                  + "Phone Number: " + customer.phone_number + elf;

       for (var i=0; i < product_codes.length; i++) {

            mailtoBody += product_codes[i] + ": " + quantities[i] + elf;

       }

       location.href = "mailto:you@example.com?body=" + mailtoBody;

    };