// randomize first sponsor
  var nbr_of_ads = 3;
  var now = new Date()
  var sec = now.getSeconds()
  var banner_left = sec % nbr_of_ads;
  banner_left +=1;
  var banner_right = banner_left +1;
  banner_right +=1;

// set gif and href for each sponsor

// Moviepark
  var banner1 = "content_images/banner_parksuche_1.jpg";
  var href1   = "http://www.moviepark.de";
  var dur1    = 5000;

// Heidepark
  var banner2 = "content_images/banner_parksuche_2.jpg";
  var href2   = "http://www.heide-park.de";
  var dur2    = 5000;

// Legoland
  var banner3 = "content_images/banner_parksuche_3.jpg";
  var href3   = "http://www.legoland.de";
  var dur3    = 5000;

// function to link to appropriate sponsor
function OpenBannerLeft()
{ 
  //if (sponsor==1) window.location.href = href1;
  if (banner_left==1) window.open(href1);
  if (banner_left==2) window.open(href2);
  if (banner_left==3) window.open(href3); 
}

function OpenBannerRight()
{ 
  //if (sponsor==1) window.location.href = href1;
  if (banner_right==1) window.open(href1);
  if (banner_right==2) window.open(href2);
  if (banner_right==3) window.open(href3); 
}

// function to rotate left banner
function rotate_left()
{
  if (++banner_left > nbr_of_ads)  banner_left = 1;
  if (banner_left==1) 
  { 
    document.getElementById("banner_left").src = banner1;
    window.setTimeout('rotate_left();', dur1);
  };  
  if (banner_left==2) 
  { 
    document.getElementById("banner_left").src = banner2;
    window.setTimeout('rotate_left();', dur2);
  };  
  if (banner_left==3) 
  { 
    document.getElementById("banner_left").src = banner3;
    window.setTimeout('rotate_left();', dur3);
  };
}

// function to rotate right banner
function rotate_right()
{
  if (++banner_right > nbr_of_ads)  banner_right = 1;
  if (banner_right==1) 
  { 
    document.getElementById("banner_right").src = banner1;
    window.setTimeout('rotate_right();', dur1);
  };  
  if (banner_right==2) 
  { 
    document.getElementById("banner_right").src = banner2;
    window.setTimeout('rotate_right();', dur2);
  };  
  if (banner_right==3) 
  { 
    document.getElementById("banner_right").src = banner3;
    window.setTimeout('rotate_right();', dur3);
  };
}