ie4=(document.all)?true:false;
ns4=(document.layers)?true:false;
		
var capans4 = null
function imagsi(imagen1,imagen2,capans4){

if(ie4){document[imagen1].src=imagen2.src;}

if(ns4){
if(capans4 != null){
document.layers[capans4].document[imagen1].src=imagen2.src;
}
else {
document[imagen1].src=imagen2.src;
}}
}

function imagno(imagen1,imagen2,capans4){

if(ie4)document[imagen1].src=imagen2;

if(ns4){
if(capans4 != null){
document.layers[capans4].document[imagen1].src=imagen2
}
else {
document[imagen1].src=imagen2;
}}
}

var ima1="img/bot_01_off.gif"
var ima2="img/bot_02_off.gif"
var ima3="img/bot_03_off.gif"
var ima4="img/bot_04_off.gif"
var ima5="img/bot_05_off.gif"
var ima6="img/bot_06_off.gif"

ima1b= new Image();
ima1b.src="img/bot_01_on.gif";
ima2b= new Image();
ima2b.src="img/bot_02_on.gif";
ima3b= new Image();
ima3b.src="img/bot_03_on.gif";
ima4b= new Image();
ima4b.src="img/bot_04_on.gif";
ima5b= new Image();
ima5b.src="img/bot_05_on.gif";
ima6b= new Image();
ima6b.src="img/bot_06_on.gif";