if(typeof(dn) == 'undefined') {
  var dn = 1;
}
    
function ss() {
  d = 'd' + dn;
  document.getElementById(d).style.backgroundImage = 'url(themes/main/images/direct.gif)';
}
   
function sr() {
  if(dn < 7) {
    d_off = 'd' + dn;
    dn = dn + 1;
    d = 'd' + dn;
    document.getElementById(d).style.backgroundImage = 'url(themes/main/images/direct.gif)';
    document.getElementById(d_off).style.backgroundImage = 'none';
  }
}
    
function sl() {
  if(dn > 1) {
    d_off = 'd' + dn;
    dn = dn - 1;
    d = 'd' + dn;
    document.getElementById(d).style.backgroundImage = 'url(themes/main/images/direct.gif)';
    document.getElementById(d_off).style.backgroundImage = 'none';
  }
}