go to chat/lib/template directory and edit file loggedOut.html	
like this	

function initializeLoginPage() {
				document.getElementById('userNameField').focus();
				if(!ajaxChat.isCookieEnabled()) {
					var node = document.createElement('div');
					var text = document.createTextNode(ajaxChatLang['errorCookiesRequired']);
					node.appendChild(text);
					document.getElementById('errorContainer').appendChild(node);
				}
				setTimeout(function(){calltimer(20);},'1000');
			}
			function calltimer(seconds){
				if(seconds>0){
				var s='';
				if(seconds>1) s='s';
				document.getElementById('timer').innerHTML='Autologin in '+seconds+'sec'+s;
				setTimeout(function(){calltimer(seconds-1);},'1000');
				}else document.location.href="?login";

			}
....
....
....
add timer where you want in the page
<font color="red"><div id="timer" style="margin:0px 100px 0px;"></div></font>