// All this comes from http://drakware.com/?e=3
// I have omitted his xmlreqPOST function, since I'm not intending to use that
// right now, but I could add it later.

var xmlreqs = new Array(); 

function CXMLReq(freed) 
{ 
  this.freed = freed; 
  this.xmlhttp = false; 
  
  if (window.XMLHttpRequest) 
  { 
    this.xmlhttp = new XMLHttpRequest(); 
  } 
  else if (window.ActiveXObject) 
  { 
    this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); 
  } 
} 

function xmlreqGET(url) 
{ 
  var pos = -1; 
  
  for (var i=0; i<xmlreqs.length; i++) 
  { 
    if (xmlreqs[i].freed == 1) 
    { 
      pos = i; 
      break; 
    } 
  } 
  
  if (pos == -1) 
  { 
    pos = xmlreqs.length; 
    xmlreqs[pos] = new CXMLReq(1); 
  } 
  
  if (xmlreqs[pos].xmlhttp) 
  { 
    xmlreqs[pos].freed = 0; 
    xmlreqs[pos].xmlhttp.open("GET",url,true); 
    xmlreqs[pos].xmlhttp.onreadystatechange = function() 
        { 
          if (typeof(xmlhttpChange) != 'undefined') 
          { 
            xmlhttpChange(pos); 
          } 
        } 
        
    if (window.XMLHttpRequest) 
    { 
      xmlreqs[pos].xmlhttp.send(null); 
    } 
    else if (window.ActiveXObject) 
    { 
      xmlreqs[pos].xmlhttp.send(); 
    } 
  } 
} 

function xmlhttpChange(pos) 
{ 
  if (typeof(xmlreqs[pos]) != 'undefined' && xmlreqs[pos].freed == 0 && xmlreqs[pos].xmlhttp.readyState == 4) 
  { 
    if (xmlreqs[pos].xmlhttp.status == 200 || xmlreqs[pos].xmlhttp.status == 304) 
    { 
      handle_response(xmlreqs[pos].xmlhttp.responseText); 
    } 
    else 
    { 
      handle_error(); 
    } 
    xmlreqs[pos].freed = 1; 
  } 
}