Snazim se udelat jednoduchy skupinovy chat. Poradite mi?

function loadLog(){        
    var oldscrollHeight = $("#chatbox").attr("scrollHeight") - 20; //posune obraz
    $.ajax({
        url: "./log.html",
        cache: false,
        success: function(html){        
            $("#chatbox").html(html); //Vlozi kod do ''chatbox"
            
            //kompletne posune stranu        
            var newscrollHeight = $("#chatbox").attr("scrollHeight") - 20; 
            if(newscrollHeight > oldscrollHeight){
                $("#chatbox").animate({ scrollTop: newscrollHeight }, 'normal'); 
            }                
          },
    });
}

setInterval(loadLog(),1000);