Скрипт на mootools - Флейм

function changePhoto(id){
var el = document.getElementById(id),
	dir = "http://site.ru/imgs/",
	num = +el.name.substring(3);
	num = num > 2 ? 0 : num++;
	el.src = dir + 'pic' + num + '.jpg';
	el.name = 'pic' + num;
}

<a href="http://site.ru/imgs/pic1.jpg"><img width="270" class="photo" src="http://site.ru/imgs/pic1.jpg" name="pic1" onload="smoothChange('photoframe')" id="photoframe"></a>

function changePhoto(id){
var el = document.getElementById(id),
	dir = "http://site.ru/imgs/",
	num = +el.name.substring(3),
	par = el.parentNode || el.parentElement;
	num = num > 2 ? 0 : num++;
	el.src = dir + 'pic' + num + '.jpg';
	el.name = 'pic' + num;
	par.href = el.src;
}

<script type="text/javascript">
function smoothChange(id){ 
setTimeout(function(){ 
changePhoto(id)},5000); 
} 
function changePhoto(id){ 
var el=document.getElementById(id); 
var num=el.name.substring(3); 
if(num>7){num=0;} 
var dir="http://uspeh.tspu.ru/tomsk/"; 
el.src=dir+'pic'+(num*1+1)+'.jpg'; 
el.name='pic'+(num*1+1); 
par.href = el.src;
}
</script>
<p><a href="tomsk/pic1.jpg" class="modal"><img width="250" class="photo" src="tomsk/pic1.jpg" name="pic1" onload="smoothChange('photoframe')" id="photoframe" /></a></p>