function RandomNumber() 
{
  var today = new Date();
  var num= Math.abs(Math.sin(today.getTime()/1000));
  return num;
}

function RandomGraphics() 
{
  var x = RandomNumber();

  if (x > .83) 
{document.write("<img src='/images/bbb6.jpg' align=center hspace=5>"); return; 
}
  if (x > .67) 
{document.write("<img src='/images/bbb5.jpg' align=center hspace=5>"); return; 
}
  if (x > .50) 
{document.write("<img src='/images/bbb4.jpg' align=center hspace=5>"); return; 
}
  if (x > .33) 
{document.write("<img src='/images/bbb3.jpg' align=center hspace=5>"); return; 
}
  if (x > .17) 
{document.write("<img src='/images/bbb2.jpg' align=center hspace=5>"); return; 
}  
  if (x > .0) 
{document.write("<img src='/images/bbb1.jpg' align=center hspace=5>"); return; 
}
}

RandomGraphics();