function update_shout(){
new Ajax.PeriodicalUpdater("ajax_shoutbox", "ajax/ajax_shoutbox.php", 
{
	frequency : 2,
	decay : 2
});
}

function sendShout(){
var params = Form.serialize($('commentsForm'));
new Ajax.Updater('ajax_shoutbox', 'ajax/ajax_shoutbox_data.php', {asynchronous:true, parameters:params});
document.getElementById("shout").value = '';
}