function isEmail(obj, msg){
    var o = document.getElementById(obj);    
    var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
    if(!o.value.match(emailExp)){
		alert(msg);
		o.focus();
		return false;
	}
	return true;
}

function updateInput(idFrom, idDest){
    var obj1 = document.getElementById(idFrom);
    var obj2 = document.getElementById(idDest);

    obj2.value = obj1.value;
}