var xmlhttp = null;

function executeAjaxCall(type, file, objectId, postVar, endaction)
{
    if (xmlhttp != null && xmlhttp.readyState != 0 && xmlhttp.readyState != 4) {
        xmlhttp.abort();
    } 
  
    if (!endaction)
    { 
		endaction = "";
    }

    try { 
        // IE does not support XMLHttpRequest, to avoid browser sniffing, this is a proper solution
        xmlhttp = window.XMLHttpRequest ? new XMLHttpRequest(): new ActiveXObject("Microsoft.XMLHTTP");
    } 
    catch (e) { 
        // use of antique browser, do what you want 
    }
  
    // when the status changes of the xmlhttp object. A function will be triggered. 
    // to pass the variables you could use the below mentioned construct. If no variables
    // should be passed you do xmlhttp.onreadystatechange = action;
    xmlhttp.onreadystatechange = function() { action(objectId, endaction);};
  
    // depending on the type a different protocal is used
    // for post action it is required to use a specific request header
    // the send() function should always contain a value, since IE can not handle an empty send()
    if(type == "POST"){
        xmlhttp.open("POST", file, true);
        xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        xmlhttp.send(postVar);
    } else{
        xmlhttp.open("GET", file, true);
        xmlhttp.send(null);
    }
}

// function used when the onready state changed
function action(objectId, endaction) 
{
    // if the ready state is finished (4) and the http status is OK (200
    // a responseText should be available
    // in this case we use the responseText to enter into the innerHTML of the object provided via the var
    if ((xmlhttp.readyState == 4) && (xmlhttp.status == 200)) {
        // xmlhttp.responseText object contains the response.  
        document.getElementById(objectId).innerHTML = xmlhttp.responseText;

		if (endaction != "")
		{
			eval(endaction);
		}

    } else {
        document.getElementById(objectId).innerHTML = "loading...."//xmlhttp.responseText;
    }
}