now=new Date() 
sec=(now.getSeconds() )%5
if (sec == 0) 
{img="fileadmin/template_puzzle/masterbgs/01.jpg";
} 
if (sec == 1) 
{img="fileadmin/template_puzzle/masterbgs/02.jpg";
}
if (sec == 2) 
{img="fileadmin/template_puzzle/masterbgs/03.jpg";
} 
if (sec == 3) 
{img="fileadmin/template_puzzle/masterbgs/04.jpg";
} 
if (sec == 4) 
{img="fileadmin/template_puzzle/masterbgs/05.jpg";
} 
document.write("<img  id='bgimg' src=",img,">");