now=new Date() 
sec=(now.getSeconds() )%6
if (sec == 0) 
{img="img/headers/01.jpg";
} 
if (sec == 1) 
{img="img/headers/02.jpg";
} 
if (sec == 2) 
{img="img/headers/03.jpg";
} 
if (sec == 3) 
{img="img/headers/04.jpg";
} 
if (sec == 4) 
{img="img/headers/05.jpg";
} 
if (sec == 5) 
{img="img/headers/06.jpg";
} 

document.write("<img src=",img,">");