function getXMLHttpRequestObject()
{
  try{
    return new XMLHttpRequest();
  }
  catch(e){
    try{
      return new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch(e){
      return false;
    }
  }
}

function startGETRequest(url, onComplete, onEnd)
{
  var XMLHttpRequestObject = getXMLHttpRequestObject();
  if(XMLHttpRequestObject){
    XMLHttpRequestObject.open("GET", url);
    XMLHttpRequestObject.onreadystatechange = function()
    {
      if (XMLHttpRequestObject.readyState == 4){
        if(XMLHttpRequestObject.status == 200){
          var responseXML = XMLHttpRequestObject.responseXML;
          var responseText = XMLHttpRequestObject.responseText;
          onComplete(responseText, responseXML);
        }
        delete XMLHttpRequestObject;
        onEnd();
      }
    }
    XMLHttpRequestObject.send(null);
  }
}

function startPOSTRequest(url, params, onComplete, onEnd)
{
  var XMLHttpRequestObject = getXMLHttpRequestObject();
  if(XMLHttpRequestObject){
    XMLHttpRequestObject.open("POST", url);
    XMLHttpRequestObject.setRequestHeader(
      'Content-Type', 'application/x-www-form-urlencoded');
    XMLHttpRequestObject.onreadystatechange = function()
    {
      if (XMLHttpRequestObject.readyState == 4){
        if(XMLHttpRequestObject.status == 200){
          var responseXML = XMLHttpRequestObject.responseXML;
          var responseText = XMLHttpRequestObject.responseText;
          onComplete(responseText, responseXML);
        }
        delete XMLHttpRequestObject;
        onEnd();
      }
    }
    XMLHttpRequestObject.send(params);
  }
}

function getData(dataSource, elementID) {
	
	var XMLHttpRequestObject = getXMLHttpRequestObject();
	if (XMLHttpRequestObject) {
		var obj = document.getElementById(elementID);
		XMLHttpRequestObject.open("GET", dataSource);
		XMLHttpRequestObject.onreadystatechange = function () {
			if (XMLHttpRequestObject.readyState == 4 ) {
				if (XMLHttpRequestObject.status == 200) {
					obj.value = XMLHttpRequestObject.responseText;
				}
			}
		}	
		XMLHttpRequestObject.send(null);
	}
}

function getProductData(dataSource, elementID, msg ) {
	
	var XMLHttpRequestObject = getXMLHttpRequestObject();
	if (XMLHttpRequestObject) {
		var err = document.getElementById('errorField');
		var obj = document.getElementById(elementID);
		
		err.style.display = 'none';
		err.innerHTML = '';
		
		XMLHttpRequestObject.open("GET", dataSource);
		XMLHttpRequestObject.onreadystatechange = function () {
			if (XMLHttpRequestObject.readyState == 4 ) {
				if (XMLHttpRequestObject.status == 200) {
					if (XMLHttpRequestObject.responseText) {
						obj.value = XMLHttpRequestObject.responseText;
					} else if (msg != '') {
					    err.style.display = 'block';
					    err.style.visibility = 'visible';
					    err.innerHTML =  msg;
						
					}
				}
			}
		}	
		XMLHttpRequestObject.send(null);
	}
}

function onEnd() {
	
}