function logout(loc) {
	lform = $('logoutform');
	lform.style.display = 'block';
	lform.innerHTML = 'logging out...';

	var ajax = new Ajax.Updater(
         'logoutform',        
         ajax_script_dir+'logout.php',        // URL
 	        {                // options
	         method:'post',
	         	postBody:'',
	             onComplete: showResponse
	             });

	function showResponse(req){
		var response = req.responseText;
		if (response == 'wrong') {
			lform.style.display = 'block';
			lform.innerHTML = response;
		} else {
			lform.innerHTML = 'u bent uitgelogd';			
		}
		location.href=loc; 
	}

}