wp-tiny-mce-custom.php

<?php
/***
 * default set up for $in['toolbar1']
 * bold,italic,strikethrough,bullist,numlist,blockquote,hr,alignleft,aligncenter,alignright,link,unlink,wp_more,spellchecker,wp_fullscreen,wp_adv
 * default set up for $in['toolbar2']
 * formatselect,underline,alignjustify,forecolor,pastetext,removeformat,charmap,outdent,indent,undo,redo,wp_help
 * default set up for $in['block_formats']
 * Paragraph=p;Address=address;Pre=pre;Heading 1=h1;Heading 2=h2;Heading 3=h3;Heading 4=h4;Heading 5=h5; Heading 6=h6
 * @package TinyMCE
 */
function gn_tinymce_filtre($in){
    $in['toolbar1']='formatselect,bold,italic,underline,bullist,numlist,blockquote,hr,alignleft,aligncenter,alignright,alignjustify,link,unlink,wp_more,spellchecker,wp_fullscreen,wp_adv ';
    $in['toolbar2']='pastetext,removeformat,charmap,outdent,indent,undo,redo,wp_help ';
    $in['block_formats'] = 'Paragraph=p;Heading 2=h2;Heading 3=h3;Heading 4=h4;Heading 5=h5';
    return $in;
}
add_filter('tiny_mce_before_init', 'gn_tinymce_filtre');