Running Ajax in Safari

Question

I am writing an app for the iphone that fetches weather information based on location. The weather feed works fine for a set location. I have created a parser that fetches gps coordinates based on a programmed called instamapper which posts coordinates online in csv format. I can execute the code fine in IE within a HTML file and see my results. However, as the iphone uses Safari I want to see what my output is. When I run the code in Safari nothing happens, at at least it does and I don't get any output. How can I see my output?

function fetchgps(callback) {
  var url = "http://www.instamapper.com/api?action=getPositions&key=584014439054448247";

  var myRequest = new XMLHttpRequest();
  myRequest.onreadystatechange = function(e) {gps_xml_loaded(event, myRequest, callback);}
  myRequest.open("GET", url);
  myRequest.setRequestHeader("Cache-Control", "no-cache");
  myRequest.setRequestHeader("wx", "385");
  myRequest.send(null);

  return myRequest;
}

function gps_xml_loaded(event, this_request, callback) {
  if (this_request.readyState == 4) {
    if (this_request.status == 200) {
      var obj = {error:false, errorString:null}
      var data = this_request.responseText;
      if (data == null) {
        callback(constructError("no <data>"));
        return;
      }

      collected=data.split(",");   //parses the data delimited by comma and put data into array
      obj.latitude = collected[3];
      obj.longitude = collected[4];
      callback(obj);
    }
    else {
      callback ({error:true, errorString:"Not Ready"}); //Could be any number of things..
    }
  }
}

function dealwithgps(obj) {
  if (obj.error == false) {
    lat = obj.latitude;
    lon = obj.longitude;
    document.write("Latitude "+lat);
    document.write("Longitude "+lon); 
  }
  else {
    document.write("error detected");
  }
}

fetchgps(dealwithgps);

Answer 1

console.log('output string' + orVariable);

that will log to the console (cmd+alt+i to open the console)
works in firefox too with the firebug extension