function trim(s){return String(s).replace(/^\s*/,"").replace(/\s*$/,"");}

function isEmail(email){
	var e=trim(email);
	return(/^([\w\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/.test(e));
	//return(/^[\w]+[\w\-]*\@[\w\-]+\.+[\w\-]+/.test(e));
}

function showError(obj, msg){
	alert(msg);
	obj.select();
	obj.focus();
}