function alertBoo(MIXID) {
   alert('boo! ' + MIXID);
   var divid = 'tracklist_' + MIXID;
   
   alert(divid);
}

function getHTTPObject(){
   if (window.ActiveXObject) return new ActiveXObject("Microsoft.XMLHTTP");
   else if (window.XMLHttpRequest) return new XMLHttpRequest();
   else {
      alert("Your browser does not support AJAX.");
      return null;
   }
}

// Change the value of the outputText field
function setOutput(MIXID){
   alert('Getting tracklist for mix ' + MIXID);
   if(httpObject.readyState == 4){
      var divid = 'tracklist_' + MIXID;
      document.getElementById(divid).innerHTML = httpObject.responseText;
   }
}

function doWork(MIXID){
   httpObject = getHTTPObject();
   if (httpObject != null) {
      httpObject.open("GET", "/getTracklist.php?mix=" + MIXID, true);
      httpObject.send(null);
      httpObject.onreadystatechange = setOutput(MIXID);
   }
}

var httpObject = null;