nombre = navigator.appName;
version = parseInt(navigator.appVersion);

if ((nombre == "Netscape" && version >= 3) || (nombre == "Microsoft Internet Explorer" && version > 3)) 
ver = "correcta";
        else ver = "incorrecta";

if (ver == "correcta") {

det1a = new Image();
det1a.src = "images/bot_deta_01_in.gif";
det1b = new Image();
det1b.src = "images/bot_deta_01.gif";

det2a = new Image();
det2a.src = "images/bot_deta_01_in.gif";
det2b = new Image();
det2b.src = "images/bot_deta_01.gif";

det3a = new Image();
det3a.src = "images/bot_deta_01_in.gif";
det3b = new Image();
det3b.src = "images/bot_deta_01.gif";

det4a = new Image();
det4a.src = "images/bot_deta_01_in.gif";
det4b = new Image();
det4b.src = "images/bot_deta_01.gif";

det5a = new Image();
det5a.src = "images/bot_deta_01_in.gif";
det5b = new Image();
det5b.src = "images/bot_deta_01.gif";


int0a = new Image();
int0a.src = "images/bot_interro_00_in.gif";
int0b = new Image();
int0b.src = "images/bot_interro_00.gif";

int1a = new Image();
int1a.src = "images/bot_interro_01_in.gif";
int1b = new Image();
int1b.src = "images/bot_interro_01.gif";

int2a = new Image();
int2a.src = "images/bot_interro_02_in.gif";
int2b = new Image();
int2b.src = "images/bot_interro_02.gif";

int5a = new Image();
int5a.src = "images/bot_interro_02_in.gif";
int5b = new Image();
int5b.src = "images/bot_interro_02.gif";

int3a = new Image();
int3a.src = "images/bot_interro_03_in.gif";
int3b = new Image();
int3b.src = "images/bot_interro_03.gif";

int4a = new Image();
int4a.src = "images/bot_interro_03_in.gif";
int4b = new Image();
int4b.src = "images/bot_interro_03.gif";

int6a = new Image();
int6a.src = "images/bot_interro_04_in.gif";
int6b = new Image();
int6b.src = "images/bot_interro_04.gif";

int7a = new Image();
int7a.src = "images/bot_interro_04_in.gif";
int7b = new Image();
int7b.src = "images/bot_interro_04.gif";


inf0a = new Image();
inf0a.src = "images/bot_info_00_in.gif";
inf0b = new Image();
inf0b.src = "images/bot_info_00.gif";

inf1a = new Image();
inf1a.src = "images/bot_info_01_in.gif";
inf1b = new Image();
inf1b.src = "images/bot_info_01.gif";


vol1a = new Image();
vol1a.src = "images/bot_vol_01_in.gif";
vol1b = new Image();
vol1b.src = "images/bot_vol_01.gif";

vol2a = new Image();
vol2a.src = "images/bot_vol_02_in.gif";
vol2b = new Image();
vol2b.src = "images/bot_vol_02.gif";

vol3a = new Image();
vol3a.src = "images/bot_vol_03_in.gif";
vol3b = new Image();
vol3b.src = "images/bot_vol_03.gif";

vol4a = new Image();
vol4a.src = "images/bot_vol_04_in.gif";
vol4b = new Image();
vol4b.src = "images/bot_vol_04.gif";

vol5a = new Image();
vol5a.src = "images/bot_vol_05_in.gif";
vol5b = new Image();
vol5b.src = "images/bot_vol_05.gif";



ent0a = new Image();
ent0a.src = "images/bot_entra_00_in.gif";
ent0b = new Image();
ent0b.src = "images/bot_entra_00.gif";

ent1a = new Image();
ent1a.src = "images/bot_entra_01_in.gif";
ent1b = new Image();
ent1b.src = "images/bot_entra_01.gif";

ent2a = new Image();
ent2a.src = "images/bot_entra_02_in.gif";
ent2b = new Image();
ent2b.src = "images/bot_entra_02.gif";

ent3a = new Image();
ent3a.src = "images/bot_entra_03_in.gif";
ent3b = new Image();
ent3b.src = "images/bot_entra_03.gif";

ent4a = new Image();
ent4a.src = "images/bot_entra_04_in.gif";
ent4b = new Image();
ent4b.src = "images/bot_entra_04.gif";

}

function abajo(imgName) {
        if (ver == "correcta") {
        document[imgName].src = eval(imgName + "a.src");
}
}
function arriba(imgName) {
        if (ver == "correcta") {
        document[imgName].src = eval(imgName + "b.src");
}
}