function picture(file, div_class, caption, orient) {
  var caption_pass;

  caption_pass = caption;

  while (caption_pass.indexOf("&") > 1)
    caption_pass = caption_pass.replace("&", "@@@"); 
  while (caption_pass.indexOf("'") > 1)
    caption_pass = caption_pass.replace("'", "^^^"); 
  while (caption_pass.indexOf("=") > 1)
    caption_pass = caption_pass.replace("=", "+++"); 

  if (orient == "portrait")
    div_class += "_port";
  else
    div_class += "_land";

  document.write("<div class='" + div_class + "'>");
  document.write("<a href='./show_chile_img.html?img=" + file + "&caption=" + caption_pass + "&orient=" + orient + "'>");
  document.write("<img src='./chile_img/" + file + "_small.jpg' border=0></a><br><br>");
  document.write(caption);
  document.write("</div>");
}