function href_vdo(filename,linktext)
{
  if(linktext == null) linktext = filename;
  document.write("<a href='http://home.online.no/~arnholm/org/vdo/" + filename  + "'>" + linktext + "</a>");
}

function href_img(filename,linktext)
{
  if(linktext == null) linktext = filename;
  document.write("<a href='http://home.online.no/~arnholm/org/img/" + filename  + "'>" + linktext + "</a>");
}

function href_zip(filename,linktext)
{
  if(linktext == null) linktext = filename;
  document.write("<a href='http://home.online.no/~arnholm/org/zip/" + filename  + "'>" + linktext + "</a>");
}

function href_exe(filename,linktext)
{
  if(linktext == null) linktext = filename;
  document.write("<a href='http://home.online.no/~arnholm/org/exe/" + filename  + "'>" + linktext + "</a>");
}

function img_img(filename,linktext,sizeinfo)
{
  if(linktext == null) linktext = filename;
  document.write("<IMG src='http://home.online.no/~arnholm/org/img/" + filename  + "' border='0' alt='"+ linktext + "' ");
  if(sizeinfo != null) document.write(sizeinfo);
  document.write("' >" + "</img>");
}

function href_img_img(filename,linktext,sizeinfo)
{
  if(linktext == null) linktext = filename;
  document.write("<a href='http://home.online.no/~arnholm/org/img/" + filename + "'>");
  document.write("<IMG src='http://home.online.no/~arnholm/org/img/" + filename  + "' border='0' alt='"+ linktext + "' ");
  if(sizeinfo != null) document.write(sizeinfo);
  document.write("' >" + "</img>");
  document.write("</a>");
}