function signOut(exitPage){
	pageBlock('Logging Out...');
	$.ajax({
		url: '/data/signout.php',
		type: 'POST',
		data: '', 
		async: false,
		cache: false,
		timeout: 30000,
		error: function(){
			alert('Sorry there was an error signing out - please try again later!');
		},
		success: function(msg){
			FB.logout();
			document.location.href='logout.php';//exitPage;
		}
	});
	return false;
}
	 
function isEmail(str) {
	// are regular expressions supported?
	var supported = 0;
	if (window.RegExp) {
		var tempStr = "a";
		var tempReg = new RegExp(tempStr);
		if (tempReg.test(tempStr)) supported = 1;
	}
	if (!supported) 
		return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
	var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
	return (!r1.test(str) && r2.test(str));
}
function shareWith(who, what){
	//alert(who+' '+what);
	pageBlock('Posting...');
	$.ajax({
		url: '/data/publish_to_friend.php',
		type: 'POST',
		data: 'friend='+who+'&id='+what, 
		async: false,
		cache: false,
		timeout: 30000,
		error: function(){
			alert('Sorry there was an error - please try again later!');
			setTimeout($.unblockUI, 0);
		},
		success: function(msg){
			$.growlUI('Message sent!', 'Thanks for sharing');
			//$.unblockUI;
		}
	});
	return false;
}