var chatscroll = new Object();

chatscroll.Pane = function(scrollContainerId){
this.bottomThreshold = 20;
this.scrollContainerId = scrollContainerId;
this._lastScrollPosition = 100000000;
}

chatscroll.Pane.prototype.activeScroll = function(){

var _ref = this;
var scrollDiv = document.getElementById(this.scrollContainerId);
var currentHeight = 0;

var _getElementHeight = function(){
var intHt = 0;
if(scrollDiv.style.pixelHeight)intHt = scrollDiv.style.pixelHeight;
else intHt = scrollDiv.offsetHeight;
return parseInt(intHt);
}

var _hasUserScrolled = function(){
if(_ref._lastScrollPosition == scrollDiv.scrollTop || _ref._lastScrollPosition == null){
return false;
}
return true;
}

var _scrollIfInZone = function(){
if( !_hasUserScrolled || 
(currentHeight - scrollDiv.scrollTop - _getElementHeight() <= _ref.bottomThreshold)){
scrollDiv.scrollTop = currentHeight;
_ref._isUserActive = false;
}
}


if (scrollDiv.scrollHeight > 0)currentHeight = scrollDiv.scrollHeight;
else if(scrollDiv.offsetHeight > 0)currentHeight = scrollDiv.offsetHeight;

_scrollIfInZone();

_ref = null;
scrollDiv = null;

}
var divScroll = new chatscroll.Pane('scroll');