pictureNumber = 0;
  totalNumber = 3;
  /* elementi variabili */
  ncol=5;
  // numero colonne;
  nfoto=10;
  // numero foto;
  folder="images/gallery/";
  //cartella in cui sono contenute le immagini
  prefisso="image";
  // elemento costante delle foto (image1.jpg,image2.jpg => image)
  suf_big="_big";
  // suffisso per le foto grandi
  suf_small="";
  // suffisso per le foto piccole
  ext=".jpg";
  // estensione foto
  /* fine elementi variabili */



function photo_grande(){
  document.write("<img src=\""+folder+prefisso+"0"+ext+"\" name=\"grande\" border=\"0\">");
}

function previous(){
  if (document.images){
     if (pictureNumber > 0) pictureNumber--
     else             
     pictureNumber = totalNumber-1
     document.images.slides.src  = pictures[pictureNumber]
   }
}
 function next(){
  if (document.images){
     if (pictureNumber < totalNumber-1)  pictureNumber++
     else                    
     pictureNumber = 0
     document.images.slides.src  = pictures[pictureNumber]
   }
} 
function photo_gallery(){
  document.write("<table cellspacing=\"0\" cellpadding=\"2\" border=\"0\">");
  for (i=1;i<=nfoto;i++){
  if (i%ncol==1) document.write("<tr>");
  document.write("<td><a href=\"#a\" onclick=\"document.grande.src='"+folder+prefisso+(i-1)+suf_big+ext+"'\">");
  document.write("<img src=\""+folder+prefisso+(i-1)+suf_small+ext+"\" border=\"0\"></a></td>");
  if (i%ncol==0) document.write("</tr>");
  }
  document.write("</table>");
}