var timerlen = 5;
var slideAniLen = 500;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var moving = new Array();
var dir = new Array();

function slidedown(objname) {
    if (moving[objname])
        return;

    if (document.getElementById(objname).style.display != "none")
        return; // cannot slide down something that is already visible

    moving[objname] = true;
    dir[objname] = "down";
    startslide(objname);
}

function slideup(objname) {
    if (moving[objname])
        return;

    if (document.getElementById(objname).style.display == "none")
        return; // cannot slide up something that is already hidden

    moving[objname] = true;
    dir[objname] = "up";
    startslide(objname);
}

function startslide(objname){
  obj[objname] = document.getElementById(objname);

  if (!obj[objname].style.height) {
      obj[objname].style.height = obj[objname].clientHeight + "px";
  }

  endHeight[objname] = parseInt(obj[objname].style.height);
  //endHeight[objname] = parseInt(obj[objname].clientHeight);

  startTime[objname] = (new Date()).getTime();
 
  if(dir[objname] == "down"){
    obj[objname].style.height = "1px";
  }
 
  obj[objname].style.display = "block";
 
  timerID[objname] = setInterval("slidetick('" + objname + "');",timerlen);
}

function slidetick(objname){
  var elapsed = (new Date()).getTime() - startTime[objname];
 
  if (elapsed > slideAniLen)
    endSlide(objname)
  else {
    var d =Math.round(elapsed / slideAniLen * endHeight[objname]);
    if(dir[objname] == "up")
      d = endHeight[objname] - d;
 
    obj[objname].style.height = d + "px";
  }
 
  return;
}

function endSlide(objname){
  clearInterval(timerID[objname]);

  if (dir[objname] == "up") {
      obj[objname].style.display = "none";
      obj[objname].style.height = endHeight[objname] + "px";
  }
  else {
      obj[objname].style.height = '';
  }
  delete(moving[objname]);
  delete(timerID[objname]);
  delete(startTime[objname]);
  delete(endHeight[objname]);
  delete(obj[objname]);
  delete(dir[objname]);
 
  return;
}

function expandCollapse(name, imgBtn) {
            var divMenue = document.getElementById(name);
            var imgButton = document.getElementById(imgBtn);
            if (divMenue) {
                if (imgButton) {
//					alert(imgButton.src);
                    if (divMenue.style.display == 'none') {
                        slidedown(divMenue.id);
                        imgButton.src = 'http://www.australiaoceaniatravel.com/images/BtnUp.png';
                    }
                    else {
                        slideup(divMenue.id);
                        imgButton.src = 'http://www.australiaoceaniatravel.com/images/BtnDown.png';
                    }
                }
            }
        }