i need help with feedback form.

<script language="javascript"><!--
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.length < field_size) {
      error_message = error_message + "* " + message + "\n";
      error = true;
    }
  }
}
 
function check_radio(field_name, message) {
  var isChecked = false;
 
  if (form.elements[field_name] && (form.elements[field_name].type != "hidden")) {
    var radio = form.elements[field_name];
 
    for (var i=0; i<radio.length; i++) {
      if (radio[i].checked == true) {
        isChecked = true;
        break;
      }
    }
 
    if (isChecked == false) {
      error_message = error_message + "* " + message + "\n";
      error = true;
    }
  }
}
 
function check_select(field_name, field_default, message) {
  if (form.elements[field_name] && (form.elements[field_name].type != "hidden")) {
    var field_value = form.elements[field_name].value;
 
    if (field_value == field_default) {
      error_message = error_message + "* " + message + "\n";
      error = true;
    }
  }
}
 
function check_password(field_name_1, field_name_2, field_size, message_1, message_2) {
  if (form.elements[field_name_1] && (form.elements[field_name_1].type != "hidden")) {
    var password = form.elements[field_name_1].value;
    var confirmation = form.elements[field_name_2].value;
 
    if (password.length < field_size) {
      error_message = error_message + "* " + message_1 + "\n";
      error = true;
    } else if (password != confirmation) {
      error_message = error_message + "* " + message_2 + "\n";
      error = true;
    }
  }
}
 
function check_password_new(field_name_1, field_name_2, field_name_3, field_size, message_1, message_2, message_3) {
  if (form.elements[field_name_1] && (form.elements[field_name_1].type != "hidden")) {
    var password_current = form.elements[field_name_1].value;
    var password_new = form.elements[field_name_2].value;
    var password_confirmation = form.elements[field_name_3].value;
 
    if (password_current.length < field_size) {
      error_message = error_message + "* " + message_1 + "\n";
      error = true;
    } else if (password_new.length < field_size) {
      error_message = error_message + "* " + message_2 + "\n";
      error = true;
    } else if (password_new != password_confirmation) {
      error_message = error_message + "* " + message_3 + "\n";
      error = true;
    }
  }
}
 
function check_form(form_name) {
  if (submitted == true) {
    alert("This form has already been submitted. Please press Ok and wait for this process to be completed.");
    return false;
  }
 
  error = false;
  form = form_name;
  error_message = "Errors have occured during the process of your form.\n\nPlease make the following corrections:\n\n";
 
  check_radio("gender", "Please select your Gender.");
 
  check_input("firstname", 2, "Your First Name must contain a minimum of 2 characters.");
  check_input("lastname", 2, "Your Last Name must contain a minimum of 2 characters.");
 
  check_input("dob", 10, "Your Date of Birth must be in this format: MM/DD/YYYY (eg 05/21/1970)");
 
  check_input("email_address", 6, "Your E-Mail Address must contain a minimum of 6 characters.");
  check_input("street_address", 5, "Your Street Address must contain a minimum of 5 characters.");
  check_input("postcode", 4, "Your Post Code must contain a minimum of 4 characters.");
  check_input("city", 3, "Your City must contain a minimum of 3 characters.");
 
  check_input("state", 2, "Your State must contain a minimum of 2 characters.");
 
  check_select("country", "", "You must select a country from the Countries pull down menu.");
 
  check_input("telephone", 3, "Your Telephone Number must contain a minimum of 3 characters.");
 
  check_password("password", "confirmation", 5, "Your Password must contain a minimum of 5 characters.", "The Password Confirmation must match your Password.");
  check_password_new("password_current", "password_new", "password_confirmation", 5, "Your Password must contain a minimum of 5 characters.", "Your new Password must contain a minimum of 5 characters.", "The Password Confirmation must match your new Password.");
 
  if (error == true) {
    alert(error_message);
    return false;
  } else {
    submitted = true;
    return true;
  }
}
//--></script>

                                              

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