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

function init(){
     $('id-form').onsubmit = get_list;

}

function reenable(){
     $('id-form').enable();
}

function get_list(){
     var url = 'calls.php';
     var pars = 'twitter-name='+escape($F('twitter-name'));
     var target = 'friendslist';
     $('id-form').disable();
     var myAjax = new Ajax.Updater(target, url, {method: 'get', parameters: pars, onComplete:reenable});
     return false;
}