function lib_bwcheck(){ //chequeador de navegadores
this.ver=navigator.appVersion
this.agent=navigator.userAgent
this.dom=document.getElementById?1:0
this.opera5=this.agent.indexOf("Opera 5")>-1
this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0; 
this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
this.ie7=(this.ver.indexOf("MSIE 7")>-1 && this.dom && !this.opera5)?1:0;
this.ie8=(this.ver.indexOf("MSIE 8")>-1 && this.dom && !this.opera5)?1:0;
this.ie4=(document.all && !this.dom && !this.opera5)?1:0;
this.ie=this.ie4||this.ie5||this.ie6||this.ie7||this.ie8
this.mac=this.agent.indexOf("Mac")>-1
this.ns6=(this.dom && parseInt(this.ver) >= 5) ?1:0; 
this.ns4=(document.layers && !this.dom)?1:0;
this.bw=(this.ie6 || this.ie5 || this.ie7 || this.ie8 || this.ie4 || this.ns4 || this.ns6 || this.opera5)
return this}
var bw=new lib_bwcheck()
/************ variables *************/
FoldNumber = 4	//numero de links principales que tiene el menu
var stayFolded = false //no permenecera visible el submenu
foldImg = 0	//imagen (si=1,no=0)
mainOffsetY = -5  //espacio vertical entre los links principales
var px = bw.ns4||window.opera?"":"px";
if(navigator.userAgent.indexOf('Opera')>-1 && document.getElementById){ //Opera 5 resize fix.
scrX= innerWidth; scrY= innerHeight;
document.onmousemove= function(){
if(scrX<innerWidth-10 || scrY<innerHeight-10 || scrX>innerWidth+10 || scrY>innerHeight+10){
scrX = innerWidth;
scrY = innerHeight;
initFoldout();
}}}
//constructor de objetos
function makeMenu(obj,nest){
nest= (!nest)?"":'document.'+nest+'.';
this.el= bw.ie4?document.all[obj]:bw.ns4?eval(nest+'document.'+obj):document.getElementById(obj);	
this.css= bw.ns4?this.el:this.el.style;
this.ref= bw.ns4?this.el.document:document;		
this.x= (bw.ns4||bw.opera5)?this.css.left:this.el.offsetLeft;
this.y= (bw.ns4||bw.opera5)?this.css.top:this.el.offsetTop;
this.h= (bw.ie||bw.ns6)?this.el.offsetHeight:bw.ns4?this.ref.height:bw.opera5?this.css.pixelHeight:0;
this.vis= b_vis;
this.hideIt= b_hideIt;
this.showIt= b_showIt;
this.moveIt= b_moveIt;
return this}
//metodos de los objetos
function b_showIt(){this.css.visibility='visible'}
function b_hideIt(){this.css.visibility='hidden'}
function b_vis(){if(this.css.visibility=='hidden' || this.css.visibility=='HIDDEN' || this.css.visibility=='hide') return true;}
function b_moveIt(x,y){this.x=x; this.y=y; this.css.left=this.x+px; this.css.top=this.y+px}
/************************************************************************************
desplegador del menu
************************************************************************************/
function menu(num){if(bw.bw){if (!stayFolded){for (var i=0; i<oSub.length; i++){if (i!=num){oSub[i].hideIt()}}
for(var i=1; i<oTop.length; i++){oTop[i].moveIt(0,oTop[i-1].y+oTop[i-1].h)}}if (oSub[num].vis()){oSub[num].showIt()
}else{oSub[num].hideIt()}
for(var i=1; i<oTop.length; i++){if (!oSub[i-1].vis()) oTop[i].moveIt(0,oTop[i-1].y+oTop[i-1].h+oSub[i-1].h+mainOffsetY);else oTop[i].moveIt(0,oTop[i-1].y+oTop[i-1].h+mainOffsetY)}}
}

/*********************************************************************/
function initFoldout(){
//opera
bw.opera5 = (navigator.userAgent.indexOf("Opera")>-1 && document.getElementById)?true:false
if (bw.opera5) bw.ns6 = 0
oTop = new Array()
oSub = new Array()
//escondiendo menus
for (var i=0; i<FoldNumber; i++){oTop[i] = new makeMenu('divTop'+i,'divCont');oSub[i] = new makeMenu('divSub'+i,'divCont.document.divTop'+i);oSub[i].hideIt()}
//posicionando objetos
oTop[0].moveIt(0,0);for (var i=1; i<oTop.length; i++){oTop[i].moveIt(0, oTop[i-1].y+oTop[i-1].h+mainOffsetY)}
//mostrando
oCont = new makeMenu('divCont');oCont.showIt()
}
// aduana

<!--
function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_showHideLayers() { //v6.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}



//-->