First of all, I've never posted before, so let me know if my etiquite is off... I don't know js, but managed to figure this out via copying and pasting;) In 3 steps: 1)I made a file called small.css comprised of


html {
	font-size: 90%;
}

2)in fontsize.module in fontsize_menu I added


''."\n".

right before the script language line. Here's my code(I have a larger.css file as well)


/**
 * Implementation of hook_menu()
 */
function fontsize_menu() {
  drupal_set_html_head(''."\n".
    ''."\n".
 ''."\n".
''."\n".
    '');
}

3)in fontsize_block in fontsize.module I added

'A'

after the corresponding spot for normal. Here's what I did(once again, I have a larger.css file)


/**
 * Implementation of hook_block()
 */
function fontsize_block($op = 'list', $delta = 0) {
  if ($op == 'list') {
    $blocks[0]['info'] = 'Change text size';
    return $blocks;
  }
  elseif ($op == 'view') {
    switch($delta) {
      case 0:
        $block['subject'] = t('Change text size');
        $block['content'] = theme('links', array(
'A', 
'A',
'A',
'A'
),' ');
        return $block;
    }
  }
}