Event.observe(window, 'load', init, false);

function init(){
     Event.observe('hang', 'change', phone, false);
}
function greet(box){
	
	 var url = 'index2.php?option=ajax';
     var pars = 'box='+box;
     var target = 'tab';
     var myAjax = new Ajax.Updater(target, url, {method: 'get', parameters: pars});
}

function phone(){
	
	 var url = 'index2.php?option=ajax1';
     var pars = 'hang='+escape($F('hang'));
     var target = 'model';
     var myAjax = new Ajax.Updater(target, url, {method: 'get', parameters: pars});
}