var http_request = false;
var divkeuze = 'a';

function makePOSTRequest(url, parameters) 
{
  http_request = false;
  if (window.XMLHttpRequest) 
  { // Mozilla, Safari,...
     http_request = new XMLHttpRequest();
     if (http_request.overrideMimeType) 
     {
     	// set type accordingly to anticipated content type
        //http_request.overrideMimeType('text/xml');
        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;
  }
 
  http_request.onreadystatechange = handleStateChange;
  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 handleStateChange(){ //alert('eee');
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            result = http_request.responseText;
            document.getElementById(divkeuze).innerHTML = result;            
         } else {
            alert('There was a problem with the request.' + http_request.status + http_request.responseText);
         }
      }
   }

function get(obj, siteitem) 
{
  divkeuze = siteitem;
  if ( divkeuze == 'mailingcontainer' )
  { 
    var poststr = "signup=" + encodeURI( document.getElementById("signup").value );
    makePOSTRequest('inc_mailing.php', poststr); 
  }
  else if ( divkeuze == 'newscontainer' )
  {  
    var poststr = "start=" + encodeURI( document.getElementById("start").value ); 
    makePOSTRequest('inc_news.php', poststr);
  }
  else if ( divkeuze == 'picscontainer' )
  { 
    var poststr = "picdir=" + encodeURI( document.getElementById("picdir").value ); 
    makePOSTRequest('inc_pictures.php', poststr);
  }
  else if ( divkeuze == 'showscontainer' )
  { 
    var poststr = "ash=" + encodeURI( document.getElementById("ash").value ) + "&showstart=" + encodeURI( document.getElementById("showstart").value ); 
    makePOSTRequest('inc_shows.php', poststr);
  }
  else
  { 
    alert('Deze div is nog niet gedeclareerd in het ajax-bestand: ' + siteitem); 
  }
}