function validateRetrive(source, args)
	{
		args.IsValid = document.getElementById('remeeAndFriendsSubscribe_chbRNFLetter').checked;
	}
	
	function openWindowCenter(url, width, height, scroll, status, resizable)
	{
		if(!status)
			status = 'no';

		if(!resizable)
			resizable = 'no';
			
		if(!scroll)
			scroll = 'no';

		var intTop = ((screen.Height / 2) - (height / 2));
		var intLeft = ((screen.Width / 2) - (width / 2));

		window.open(url, '', 'width='+ width +', height='+ height +', resizable='+ resizable +', location=no, titlebar=no, toolbar=no, menubar=no, directories=no, channelmode=no,  scrollbars='+ scroll +', status='+ status +', top='+ intTop +', left='+ intLeft +'');
	}