function include_css(accessibility_type) {
	var css  = document.createElement('link');
	css.rel = 'stylesheet'
	css.type = 'text/css';
	css.href = 'templates/englischgruss/css/accessibility_helper/' + accessibility_type + '.css';
	document.getElementsByTagName('head')[0].appendChild(css);
	
	// ajax request to save
	new Ajax.Request('templates/englischgruss/ajax_handler.php?ajax_accessibility=' + accessibility_type);
}