function prev() {
  if(nr==1) {
    $('mini').hide();

    nr=photos;

    $('mini').src = "images/"+what+"/"+nr+".jpg";
    $('show').href = "images/"+what+"/big/"+nr+".jpg";
    $('show2').href = "images/"+what+"/big/"+nr+".jpg";

    $('mini').appear();
  }
  else {
    $('mini').hide();
    
    nr--;

    $('mini').src = "images/"+what+"/"+nr+".jpg";
    $('show').href = "images/"+what+"/big/"+nr+".jpg";
    $('show2').href = "images/"+what+"/big/"+nr+".jpg";

    $('mini').appear();
  }

}

function next() {

  if(nr==photos) {
    $('mini').hide();

    nr=1;
    $('mini').src = "images/"+what+"/"+nr+".jpg";
    $('show').href = "images/"+what+"/big/"+nr+".jpg";
    $('show2').href = "images/"+what+"/big/"+nr+".jpg";



    $('mini').appear();

  }
  else  {
    $('mini').hide();

    nr++;
    $('mini').src = "images/"+what+"/"+nr+".jpg";
    $('show').href = "images/"+what+"/big/"+nr+".jpg";
    $('show2').href = "images/"+what+"/big/"+nr+".jpg"; 
    

    $('mini').appear();
  }

}