var req;
var dest;

function getURLParam(strParamName){
  var strReturn = "";
  var strHref = window.location.href;
  if ( strHref.indexOf("?") > -1 ){
    var strQueryString = strHref.substr(strHref.indexOf("?")).toLowerCase();
    var aQueryString = strQueryString.split("&");
    for ( var iParam = 0; iParam < aQueryString.length; iParam++ ) {
      if (aQueryString[iParam].indexOf(strParamName + "=") > -1 ) {
        var aParam = aQueryString[iParam].split("=");
        strReturn = aParam[1];
        break;
      }
    }
  }
  return strReturn;
}


function processStateChange(){
  statusDiv = document.getElementById("status");
  if (req.readyState == 0){
     statusDiv.innerHTML = "UNINITIALIZED";
  }

  if (req.readyState == 1){
     statusDiv.innerHTML = "LOADING";
  }

  if (req.readyState == 2){
     statusDiv.innerHTML = "LOADED";
  }

  if (req.readyState == 3){
     statusDiv.innerHTML = "INTERACTIVE";
  }
  if (req.readyState == 4){ statusDiv.innerHTML = " "; }

  if (req.readyState == 4){
    if (req.status == 200){
       response = req.responseText;
       destinationDiv = document.getElementById(dest);
       destinationDiv.innerHTML = response;
    } else {
       statusDiv.innerHTML = "Error: Status "+req.status;
    }
  }
}

function loadHTML(url, destination){
  dest = destination;
  if (window.XMLHttpRequest){
      req = new XMLHttpRequest();
      req.onreadystatechange = processStateChange;
      req.open("GET", url, true);
      req.send(null);
  } else if (window.ActiveXObject) {
        req = new ActiveXObject("Microsoft.XMLHTTP");
        if (req) {
            req.onreadystatechange = processStateChange;
            req.open("GET", url, true);
            req.send();
        }
   }
}