function banner() { } ; b = new banner() ; n = 0
b[n++]= "<img src='/images/billboard-businessman.png' border='0' >"
b[n++]= "<img src='/images/billboard-businesswoman.png' border='0' >"
b[n++]= "<img src='/images/billboard-worker.png' border='0' >"
i=Math.floor(Math.random() * n) ;
document.write( b[i] )