Web Development

function http (m, u, d, f)
{
 var r = null;
 if (window.XMLHttpRequest)
 {
  r = new XMLHttpRequest();
  if (r.overrideMimeType)
  {
   r.overrideMimeType('text/xml');
  }
 }
 else if (window.ActiveXObject)
 {
  try
  {
   r = new ActiveXObject('Msxml2.XMLHTTP');
  }
  catch(e)
  {
   try
   {
    r = new ActiveXObject('Microsoft.XMLHTTP');
   }
   catch(e){}
  }
 }
 if (r)
 {
  r.onreadystatechange = function()
  {
   if (r.readyState == 4)
   {
    alert(r.readyState); //This is 4 when the error occures
    if (r.status == 200)
    {
     f(r.responseText); //ERROR here "The data necessary to complete this operation is not yet available."
    }
   }
  };
  r.open(m, u, true);
  r.setRequestHeader('Connection', 'close');
  if (d) r.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
  r.send(d);
 }
}

var df=document.getElementsByTagName("PARAM")[0].value;
http('GET','http://example.net/'+df,'', function(data){alert(data);});