jQuery / Ajax – $.ajax() Passing Parameters to Callback – Good Pattern to Use?

Like this…

function doSomething(url, elem) {
  $.ajax({
     type: "GET",
     url: url,
     dataType: "xml",
     success: function(xml) {
       rssToTarget(xml, elem);
     }
  });
}

Answer to your comment: Does use of anonymous functions affect performance?