if (document.getElementById) {
  // Disminuir tamano letra.
  document.write('<tr><td width="40" valign="top"><a href="javascript: void(0);" onClick="cambia_size(' + "'mas'" + ')" onMouseOver="ima_on('+ "'aum', 'auxi'" + ')" onMouseOut="ima_of('+ "'aum', 'auxi'" + ')"><img src="/prontus_costadigital/imag/auxi/aum_of.gif" border="0" alt="Aumentar tamaņo de fuente" title="Aumentar tamaņo de fuente" name="aum" width="40" height="35"></a></td></tr>');
  // Aumentar tamano letra.
  document.write('<tr><td width="40" valign="top"><a href="javascript: void(0);" onClick="cambia_size(' + "'menos'" + ')" onMouseOver="ima_on('+ "'dis', 'auxi'" + ')" onMouseOut="ima_of('+ "'dis', 'auxi'" + ')"><img src="/prontus_costadigital/imag/auxi/dis_of.gif" border="0" alt="Disminuir tamaņo de fuente" title="Disminuir tamaņo de fuente" name="dis" width="40" height="35"></a></td></tr>');
}else{
};