How can I use jQuery blockUI to display a variable

I am using blockUI to display a waiting message while an ajax request is submitted. When the ajax request returns successful I am using blockUI to show a successful message. Within that message I would like to display the contents of data.message but I am unsure how to do this.

This is the ajax success code...

		success: function(data) {
			if (data.status == "success") {

				alert("SUCCESS " + data.message);   //Used to test variable

				$.blockUI({ message: 'SUCCESS' . data.message });

				setTimeout(function(){$.unblockUI;
				window.location.href = "index.php";
				}, 3000);

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Could someone help?

Thanks

Steve