$.get() doesn't run callback function

$.get() doesn't run callback function

I was gonna post about another $.get() related problem I had but as I was typing it out I figured out what was wrong. However, I have a $.get() call in a div mouseover event which is supposed to retrieve some data for another div to display. The get call gets a 200 OK but the callback function doesn't run.

$.get("default2.aspx",{id: getNumber($(this).attr("id")), e: "mo"}, function(xml){
       alert("hello");
     //$(thisid).append($("name", xml).text());
});


The commented out part is what I want to do but just doing a simple alert doesn't work.

Any ideas on what's causing this?