function changePhoto(id)
{
 var el=document.getElementById(id);
 var num=el.name.substring(3);
if(num>3){num=0;}
 var dir="/images/design/title/";
 el.src=dir+'pic'+(num*1+1)+'.jpg';
 el.name='pic'+(num*1+1);
}
function smoothChange(id)
{
 setTimeout(function(){changePhoto(id)},5000);
}