[A1ien51]

store your timeout into a variable

ticktock = window.setTimeout("TICKER_tick()", 30);

and you need to cancel it when you get the Ajax call back

if(xmlHttp.readyState == 4){
  var response = xmlHttp.responseText;
  TICKER.innerHTML = response;
  setTimeout('callServer()',5000);
  TICKER_CONTENT = document.getElementById("TICKER").innerHTML;
  TICKER_RIGHTTOLEFT = false;
  TICKER_SPEED = 2;
  TICKER_STYLE = "font-family:Arial; font-size:12px; color:#444444";
  TICKER_PAUSED = false;
  window.clearTimeout(ticktock);
  ticker_start(); 
}

Eric