var Sticky = (function(){
	        function StickyClass(config)  {
	            this.placeholder = config.placeholder;
	            this.elementList = config.childList || [];
	            this.container = config.fixedContainer;
	            this.class = config.class || {
	                sticky : 'sticky',
	                nonSticky : 'non-sticky'
	            }; //sticky nonsticky
	            this.elementAdded = false;
	            //this.animate = config.animate;
	            this.init = function() {
	            	this.addElementInFixedContainer();
	            	return this;
	            }
	            
	            this.footer = config.footer || $('#footer');

	            $(window).scroll(function(){
	                if(!this.ui){
	                    this.ui = require('ui');
	                }
	                var containerRects = this.placeholder.getClientRects().item(0);
	                
	                if(containerRects.bottom < 0 && (!this.ui.inView(this.footer,true))) {
	                    this.setStickyNonSticky(true);
	                }
	                else if(containerRects.bottom > 0 || this.ui.inView(this.footer,true)){
	                    this.setStickyNonSticky(false);
	                }
	            }.bind(this));
	        }
	        
            StickyClass.prototype.addElementInFixedContainer = function(){
                if(this.elementAdded)return
                for(var i=0; i<this.elementList.length; i++) {
                    this.container.appendChild(this.elementList[i]);
                }
                elementAdded = true;
            }
            
            StickyClass.prototype.setStickyNonSticky = function(status) {
                var container = $(this.container);
                if(status)//enablelif true
                {
                    container.addClass(this.class.sticky);
                }else {
                    container.removeClass(this.class.sticky);
                }
            }
            
	        return StickyClass
	        })();