var EmailCheck = new RegExp("^[A-z0-9\._%-]+@([A-z0-9-]+\.)+[A-z]{2,4}$", "i");

function CheckForm()
{
	if (document.reminder.remind_mail.value=="" || !EmailCheck.test(document.reminder.remind_mail.value)) {
		 window.alert("Please, enter valid your E-mail address!");
		 document.reminder.remind_mail.focus();
    	 return false;
	}
}