var obj

function display(album,id) {
  setDark();
  obj = getHttpObject();
  if  ( obj == null ) {
    alert("Browser not supported");
    return;
  }
  var url = "gallery.php?";
  url = url+"albumid="+album+"&id="+id;
  obj.onreadystatechange = stateChange
  obj.open("GET",url,true);
  obj.send(null);
}

function stateChange() {
  if ( obj.readyState == 4 || obj.readyState == "complete" ) {
    document.getElementById("pic").innerHTML=obj.responseText
  }
}

function getHttpObject() {
  var retObj = null;
  if ( window.XMLHttpRequest ) {
    retObj = new XMLHttpRequest()
  }
  else if ( window.ActiveXObject ) {
    retObj = new ActiveXObject("Microsoft.XMLHTTP")
  }
  return retObj
}

function setDark() {
  document.getElementById("top_img").style.display="none"
  document.getElementById('darkBackground').style.display='block'
  document.getElementById('pic').style.display='block'
}

function setClear() {
  document.getElementById("top_img").style.display="block"
  document.getElementById('darkBackground').style.display='none'
  document.getElementById('pic').style.display='none'
}