function other_species(this_species, mode)
{

    var species = new Array;

    var i = 0;

    species[i++]="Crypturellus parvirostris"; 
    species[i++]="Crypturellus tataupa"; 
    species[i++]="Nothura boraquira"; 
    species[i++]="Podilymbus podiceps"; 
    species[i++]="Tachybaptus dominicus"; 
    species[i++]="Bubulcus ibis"; 
    species[i++]="Butorides striatus"; 
    species[i++]="Casmerodius albus"; 
    species[i++]="Egretta thula"; 
    species[i++]="Tigrisoma lineatum"; 
    species[i++]="Cathartes aura"; 
    species[i++]="Cathartes burrovianus"; 
    species[i++]="Coragyps atratus"; 
    species[i++]="Anas bahamensis"; 
    species[i++]="Amazonetta brasiliensis"; 
    species[i++]="Dendrocygna viduata"; 
    species[i++]="Nomonyx dominicus"; 
    species[i++]="Buteogallus meridionalis"; 
    species[i++]="Buteogallus urubitinga";
    // species[i++]="Chondrohierax uncinatus"; 
    species[i++]="Rupornis magnirostris"; 
    species[i++]="Herpetotheres cachinnans"; 
    species[i++]="Polyborus plancus"; 
    species[i++]="Penelope jacucaca"; 
    species[i++]="Aramus guarauna"; 
    species[i++]="Aramides cajanea"; 
    species[i++]="Gallinula chloropus"; 
    species[i++]="Porphyrula martinica"; 
    species[i++]="Charadrius collaris"; 
    species[i++]="Charadrius semipalmatus"; 
    species[i++]="Vanellus chilensis"; 
    species[i++]="Jacana jacana"; 
    // species[i++]="Himantopus himantopus"; 
    species[i++]="Tringa solitaria"; 
    species[i++]="Tringa sp"; 
    species[i++]="Claravis pretiosa"; 
    // species[i++]="Columba picazuro"; 
    species[i++]="Columbina minuta"; 
    species[i++]="Columbina picui"; 
    species[i++]="Columbina talpacoti"; 
    species[i++]="Leptotila verreauxi"; 
    species[i++]="Scardafella squammata"; 
    species[i++]="Zenaida auriculata"; 
    species[i++]="Aratinga cactorum"; 
    species[i++]="Forpus xanthopterygius"; 
    species[i++]="Coccyzus melacoryphus"; 
    species[i++]="Crotophaga ani"; 
    // species[i++]="Crotophaga major"; 
    species[i++]="Guira guira"; 
    species[i++]="Piaya cayana"; 
    species[i++]="Glaucidium brasilianum"; 
    species[i++]="Otus choliba"; 
    // species[i++]="Speotyto cunicularia"; 
    // species[i++]="Nyctibius griseus"; 
    species[i++]="Caprimulgus parvulus";
    species[i++]="Hydropsalis torquata";
    species[i++]="Nyctidromus albicollis"; 
    // species[i++]="Anthracothorax nigricollis";
    species[i++]="Amazilia sp"; 
    species[i++]="Chlorostilbon aureoventris"; 
    // species[i++]="Chrysolampis mosquitus"; 
    // species[i++]="Eupetomena macroura"; 
    species[i++]="Trogon curucui"; 
    // species[i++]="Ceryle torquata"; 
    species[i++]="Chloroceryle amazona"; 
    species[i++]="Chloroceryle americana"; 
    species[i++]="Nystalus maculatus"; 
    species[i++]="Celeus flavescens"; 
    species[i++]="Picumnus limae"; 
    // species[i++]="Colaptes melanochloros"; 
    // species[i++]="Piculus chrysochloros"; 
    species[i++]="Veniliornis passerinus"; 
    species[i++]="Furnarius leucopus"; 
    species[i++]="Certhiaxis cinnamomea"; 
    // species[i++]="Synallaxis frontalis"; 
    species[i++]="Lepidocolaptes angustirostris"; 
    // species[i++]="Sittasomus griseicapillus"; 
    species[i++]="Casiornis fusca"; 
    // species[i++]="Empidonomus varius"; 
    species[i++]="Megarynchus pitangua"; 
    species[i++]="Myiarchus tyrannulus"; 
    species[i++]="Myiodynastes maculatus"; 
    species[i++]="Myiozetetes similis"; 
    species[i++]="Pitangus sulphuratus"; 
    species[i++]="Tyrannus melancholicus"; 
    species[i++]="Camptostoma obsoletum"; 
    species[i++]="Elaenia spectabilis"; 
    species[i++]="Euscarthmus meloryphus"; 
    species[i++]="Hemitriccus margaritaceiventer"; 
    species[i++]="Myiopagis viridicata"; 
    species[i++]="Todirostrum cinereum"; 
    species[i++]="Tolmomyias flaviventris"; 
    species[i++]="Arundinicola leucocephala"; 
    species[i++]="Cnemotriccus fuscatus"; 
    species[i++]="Fluvicola nengeta"; 
    species[i++]="Machetornis rixosus"; 
    species[i++]="Pachyramphus polychopterus"; 
    species[i++]="Pachyramphus validus"; 
    species[i++]="Pachyramphus viridis"; 
    species[i++]="Formicivora grisea"; 
    species[i++]="Formicivora melanogaster"; 
    species[i++]="Herpsilochmus atricapillus"; 
    species[i++]="Herpsilochmus sellowi"; 
    species[i++]="Taraba major"; 
    species[i++]="Thamnophilus doliatus"; 
    species[i++]="Thamnophilus pelzelni"; 
    species[i++]="Phaeoprogne tapera"; 
    species[i++]="Cyanocorax cyanopogon"; 
    species[i++]="Thryothorus longirostris"; 
    // species[i++]="Troglodytes aedon"; 
    species[i++]="Polioptila plumbea"; 
    // species[i++]="Turdus amaurochalinus"; 
    species[i++]="Turdus rufiventris"; 
    species[i++]="Cyclarhis gujanensis"; 
    species[i++]="Hylophilus amaurocephalus"; 
    species[i++]="Vireo olivaceus"; 
    species[i++]="Basileuterus culicivorus"; 
    species[i++]="Basileuterus flaveolus"; 
    species[i++]="Parula pitiayumi"; 
    species[i++]="Coereba flaveola"; 
    // species[i++]="Conirostrum speciosum"; 
    species[i++]="Euphonia chlorotica"; 
    species[i++]="Nemosia pileata"; 
    species[i++]="Piranga flava";
    species[i++]="Tangara cayana"; 
    species[i++]="Thraupis sayaca"; 
    species[i++]="Passerina brissonii"; 
    species[i++]="Ammodramus humeralis"; 
    species[i++]="Arremon taciturnus"; 
    species[i++]="Coryphospingus pileatus"; 
    species[i++]="Paroaria dominicana"; 
    species[i++]="Sporophila albogularis"; 
    species[i++]="Sporophila lineola"; 
    species[i++]="Volatinia jacarina"; 
    species[i++]="Agelaius ruficapillus"; 
    species[i++]="Cacicus solitarius"; 
    species[i++]="Icterus cayanensis"; 
    // species[i++]="Icterus jamacaii"; 
    // species[i++]="Leistes superciliaris"; 
    species[i++]="Molothrus bonariensis"; 
    species[i++]="Passer domesticus"; 

    var flag = 0;
    var j = 0; 

    var file_type = "_00.html";

    for (j=0; j < (species.length); j++) {

	if ((species[j] == this_species) && (flag == 0)) {
	    flag = 1;
	    continue;
	}

	if (flag == 1) {

	    var k;
	    if (mode=='next') k=j; 
	    // PREVIOUS on the first one => go to last one 
	    else if (j == 1) k=species.length-1;
	    else k=j-2;

	    // if there is a prev for the first species
            k = ( k<0 ? 0 : k );

	    if (( species[k] == "Basileuterus culicivorus" ) ||
	        ( species[k] == "Claravis pretiosa" ) ||
	        ( species[k] == "Cnemotriccus fuscatus" ) ||
	        ( species[k] == "Coccyzus melacoryphus" ) ||
	        ( species[k] == "Crypturellus tataupa" ) ||
	        ( species[k] == "Elaenia spectabilis" ) ||
	        ( species[k] == "Euphonia chlorotica" ) ||
	        ( species[k] == "Euscarthmus meloryphus" ) ||
	        ( species[k] == "Formicivora grisea" ) ||
	        ( species[k] == "Hemitriccus margaritaceiventer" ) ||
	        ( species[k] == "Herpetotheres cachinnans" ) ||
	        ( species[k] == "Herpsilochmus atricapillus" ) ||
	        ( species[k] == "Herpsilochmus sellowi" ) ||
	        ( species[k] == "Hylophilus amaurocephalus" ) ||
	        ( species[k] == "Pachyramphus polychopterus" ) ||
	        ( species[k] == "Pachyramphus validus" ) ||
	        ( species[k] == "Pachyramphus viridis" ) ||
	        ( species[k] == "Parula pitiayumi" ) ||
	        ( species[k] == "Picumnus limae" ) ||
	        ( species[k] == "Tangara cayana" ) ||
	        ( species[k] == "Vireo olivaceus" ))
	        file_type = "_voc_00.html";

	    filename=species[k].split(" ")[0] + "_" + 
		species[k].split(" ")[1] + file_type;
	    
	    return filename.toLowerCase();
	}
    }

    // the last one, with next
    if (mode == 'next') {
	filename=species[0].split(" ")[0] + "_" + 
	         species[0].split(" ")[1] + "_00.html";

    // if (mode == 'next') {
	// filename=this_species.split(" ")[0] + "_" + 
	    // this_species.split(" ")[1] + "_00.html";

    }
    // the last one, with previous
    else {
        k = species.length-2;
	filename=species[k].split(" ")[0] + "_" + 
	    species[k].split(" ")[1] + "_00.html";
    }

    return filename.toLowerCase();
}