function checkForm(form_name) {
  		if (submitted == true) {
    		alert('This form has been already submitted, please be patient while we process your information.');
    		return false;
  		}
  		error = false;
		form = form_name;
		error_message = 'You forgot to complete some parts of this form.';

		check_input('Name', 2, 'Please Check Your Name');
		check_input('Phone', 8, 'Please Check Your Phone Number');
		check_input('Email', 8, 'Please Check Your Email Address.');
		check_input('themensagem', 2, 'Please Check Your Message');
		if (error == true) {
			alert(error_message);
    		return false;
  		} else {
    		submitted = true;
    		return true;
  		}
}

var form = "";
var submitted = false;
var error = false;
var error_message = "";

function check_input(field_name, field_size, message) {
  if (form.elements[field_name] && (form.elements[field_name].type != "hidden")) {
    var field_value = form.elements[field_name].value;

    if (field_value == '' || field_value.length < field_size) {
      error_message = error_message + "\n* " + message;
      error = true;
    }
  }
}