function galleryBlock(itemId,itemNo,refTime) {
    var http_request = false;
    if (window.XMLHttpRequest) { 
      http_request = new XMLHttpRequest();
    } 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('Giving up :( Cannot create an XMLHTTP instance');
      return false;
    }
    http_request.onreadystatechange = function() { updateBlock(http_request,itemId,itemNo,refTime); };
    var d = new Date(); 
    http_request.open('GET', "../../galleryBlock.php?t="+d.getTime()+"&itemId="+itemId+"&itemNo="+itemNo, true);
    http_request.send(null);
  }

function updateBlock(http_request,itemId,itemNo,refTime) {
    if (http_request.readyState == 4) {
      if (http_request.status == 200) {

        var mesg = http_request.responseText;
        var block = document.getElementById("gallery");
        block.innerHTML = mesg;
		if (refTime != 0) {		
	        	setTimeout("galleryBlock("+itemId+","+itemNo+",1)",15000);
		}
        }
    }
  }