var http_request = false;

function loader() {
	/*
	var statusDiv = document.getElementById("statusDiv");
	statusDiv.style.visibility="visible";
	statusDiv.innerHTML = '<img src="img/ajax-loader.gif">';
	*/
}

function callScript(scriptname, poststr) {	
	//loader();
	scriptname = scriptname + ".php";
	makePOSTRequest(scriptname, poststr);
}

function makePOSTRequest(url, parameters) {
  http_request = false;
  if (window.XMLHttpRequest) { // Mozilla, Safari,...
     http_request = new XMLHttpRequest();
     if (http_request.overrideMimeType) {     	
        http_request.overrideMimeType('text/html');
     }
  } else if (window.ActiveXObject) { // IE
     try {
        http_request = new ActiveXObject("Msxml2.XMLHTTP");
     } catch (e) {
        try {
           http_request = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e) {}
     }
  }
  if (!http_request) {
     alert('Cannot create XMLHTTP instance');
     return false;
  }
  
  switch (url) {	  
	  default: http_request.onreadystatechange = alertContents; break;
  }
  
  http_request.open('POST', url, true);
  
  http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  http_request.setRequestHeader("Content-length", parameters.length);
  http_request.setRequestHeader("Connection", "close");
  http_request.send(parameters);
}

function alertContents() {
  if (http_request.readyState == 4) {
     if (http_request.status == 200) {        
        result = http_request.responseText;
        alert(result);
        //document.getElementById('statusDiv').innerHTML = result;
     } else {
        alert('There was a problem with the request.');
     }
  }
}