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<?php

function THEMENAME_preprocess_html(&$variables, $hook) {
  // add apple touch icon to print_head
  $apple_icon = array(
    	'#tag' => 'link', 
		'#attributes' => array(
				'rel' => 'apple-touch-icon-precomposed', 
				'href' => '/' . path_to_theme() . '/apple-touch-icon-precomposed.png'
				),
		);
		drupal_add_html_head($apple_icon, 'apple-touch-icon-precomposed');
}

?>