checkboxes on change on submit code example

Example 1: submit form when checkbox is checked

<input onChange="this.form.submit()" ... />

Example 2: checkbox onchange submit form

<form method='post' action='#'>
<input type='checkbox' name='checkbox' onChange='submit();'
<?php if($page->checkbox_state == 1) { echo 'checked' }; ?>>
</form>