var LoadingBar = Class.create();
    LoadingBar.prototype = {
    
        initialize:function(nodeId){
            this.DOMNode = $(nodeId);
        },
        
        activate:function(message)
        {
            this.DOMNode.addClassName("activate");
            this.DOMNode.update(message);
        },
        
        desactivate:function()
        {
            window.setTimeout(function(){
                this.DOMNode.removeClassName("activate");
                this.DOMNode.update("");
            }.bind(this), 500);
        }
   
    }