[jQuery] $.getJSON not a function?

[jQuery] $.getJSON not a function?

I'm using the packed jQuery library from August 31st.
My script to display a list of tags is:
  function loadTags() {
    $.getJSON("tag.ajx",
        { id: "${ <a href="http://model.item.id">
model.item.id</a>}" },
        function(json){
       
      tags = json.tags;
      if(tags.size() > 0) {
        $("#tagDisplayArea").empty().append("Technorati Tags: <ul>");
        for(i = 0; i < tags.size(); i++) {
          $("#tagDisplayArea").append("<li>"+ tags[i] +"</li>");
        }
        $("#tagDisplayArea").append("</ul>");
      }
    });
My browser (Firefox) is reporting "$.getJSON is not a function". 
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