// Attach handler to window load event
Event.observe(window, 'load', ajaxGETTIBETANEVENT, false); 

function init() { 
 // Attach handler to form's submit event
	Event.observe('SEL_MONTH', 'change', ajaxUpdater);
}

function ajaxGETTIBETANEVENT(e){
   var url = 'actionprocessajax.php';
   var pars = 'SEL_MONTH='+escape($F('SEL_MONTH'));
   var target = 'updateme';
   var myAjax = new Ajax.Updater(target, url, {method: 'get', parameters: pars});
}