clear form values after submission ajax

$("#cform")[0].reset();

or in plain javascript:

document.getElementById("cform").reset();

You can do this inside your $.post calls success callback like this

$.post('mail.php',{name:$('#name').val(),
                              email:$('#e-mail').val(),
                              phone:$('#phone').val(),
                              message:$('#message').val()},

            //return the data
            function(data){

              //hide the graphic
              $('.bar').css({display:'none'});
              $('.loader').append(data);

              //clear fields
              $('input[type="text"],textarea').val('');

            });

use this:

$('form.contactForm input[type="text"],texatrea, select').val('');

or if you have a reference to the form with this:

$('input[type="text"],texatrea, select', this).val('');

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:input === <input> + <select>s + <textarea>s