function usr_limpiar_acentos ($columns, $col, $param)
#ejem {alias:headline........:f_u:usr_limpiar_acentos:}
{
$tofind = "ÀÁÂÃÄÅàáâãäåÒÓÔÕÖØòóôõöøÈÉÊËèéêëÇçÌÍÎÏìíîïÙÚÛÜùúûüÿÑñ";
$replac = "AAAAAAaaaaaaOOOOOOooooooEEEEeeeeCcIIIIiiiiUUUUuuuuyNn";
return(strtr($columns[$col][0][value],$tofind,$replac));
}