Override or insert variables into the html template.
function garland_preprocess_html(&$variables) {
// Toggle fixed or fluid width.
if (theme_get_setting('garland_width') == 'fluid') {
$variables['classes_array'][] = 'fluid-width';
}
// Add conditional CSS for IE6.
drupal_add_css(path_to_theme() . '/fix-ie.css', array(
'group' => CSS_THEME,
'browsers' => array(
'IE' => 'lt IE 7',
'!IE' => FALSE,
),
'preprocess' => FALSE,
));
}