function toggle(id)
{
	var node = document.getElementById(id);
	node.style.display = (node.style.display == 'none') ? '' : 'none';
}

function sendToFriend()
{
	var re = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/;
	var sender = document.getElementById('sender').value;
	var recipient = document.getElementById('recipient').value;
	var msgBlock = document.getElementById('msg');
	
	if (!re.test(recipient)) {
		msgBlock.firstChild.nodeValue = document.getElementById('errorRecipient').firstChild.nodeValue;
		msgBlock.style.display = '';
		return false;
	}
	
	if (!re.test(sender)) {
		msgBlock.firstChild.nodeValue = document.getElementById('errorSender').firstChild.nodeValue;
		msgBlock.style.display = '';
		return false;
	}
	
	return true;
}