In contrast to Drupal 6, Drupal 5 has no protection from multiple form processing. If a user clicks "Submit" button a few times, duplicated posts will appear.

Solutions

• Hide buttons once Submit button is clicked

Insert the following code to the end of page.tpl.php template:

$(document).ready(function() {
$(‘input[@type=submit]’).click(function() {
$(this).siblings(‘input[@type=submit]’).hide();
$(this).hide();
$(‘<p class="loading">OK…</p>’).insertAfter(this).slideDown(‘fast’);
})
})

How it works: when Submit button is clicked, all buttons disappears and a user couldn’t click them again.

• Use Form single module

Download&use this module to prevent duplicated posts: http://drupal.org/project/formsingle

Good luck!