XMLHttpRequest access file in Public Dropbox
function getParameters() {
var oRequest = new XMLHttpRequest();
var sURL = "http://dl.dropbox.com/u/7828009/Relay%20Fundraising%20Site/parameters.txt";
// var sURL = "file:///parameters.txt";
oRequest.open("GET",sURL,false);
    oRequest.onreadystatechange = function (oEvent) {
    if (oRequest.readyState === 4) {
        if (oRequest.status === 200) {
          console.log(oRequest.responseText)
    } else {
      console.log("Error", oRequest.statusText);
    }
  }
};
oRequest.setRequestHeader("User-Agent",navigator.userAgent);
try {
    oRequest.send(null)
} catch (err) {
    alert(err);
}

if (oRequest.status==200) alert(oRequest.responseText);
else alert("Error executing XMLHttpRequest call!");
}

XMLHttpRequest cannot load http://dl.dropbox.com/u/7828009/Relay%20Fundraising%20Site/parameters.txt. Origin null is not allowed by Access-Control-Allow-Origin.

http://dl.dropbox.com/u/7828009/Relay%20Fundraising%20Site/main.htm

XMLHttpRequest cannot load http://www.javascripter.net/faq/requested_file.htm. Origin http://dl.dropbox.com is not allowed by Access-Control-Allow-Origin.