$(this).attr() trouble

[Tenaciousmug]

$(document).ready(function() {
$(".alert").click(function() {
	{
		var id = $(this).attr("id");
		alert(id);
		$(id).dialog();
		return false;
	}
});
});

 

Ok it's alerting the id AFTER it alerts an undefined.. so it alerts "undefined" and then "5" or whatever the number may be.

What am I doing wrong?