$("reg_form").onsubmit = function(){
	var url = "ajax_send_reg.php";
	var pars = Form.serialize("reg_form");
	var myAjax = new Ajax.Updater("reg",url, 
		{ 
			method: 'post',
			parameters: pars,
			onComplete: function(text) {
				var res = text.responseText;
				//alert(res);
			}
		}
	);
	return false;
}