// JavaScript Document
ngLamina          = -1;
ngMaxLam		  = 3;

function ver_lamina(nLam) { //v3.0
	
	var actual_lam = ngLamina;
	ngLamina=ngLamina  + nLam;
	if (ngLamina<=0 ){
	ngLamina = ngMaxLam;
	} 
	if (ngLamina>ngMaxLam){
	ngLamina = 1;
	}
	if (actual_lam!=-1){
	var divh=document.getElementById("divTopMenu" + actual_lam);
	divh.style.visibility= "hidden";	
	} 
	//else {
	//actual_lam = ngMaxLam;
	//}
	//alert("ajaa" + ngLamina);
	
	var divv=document.getElementById("divTopMenu" + ngLamina);
	divv.style.visibility= "visible";
	
}



var promotion_index = 0;
function avanza_lamina() 
{
   an_lamina(1);
}
 
function retro_lamina() 
{
   an_lamina(-1);
}


var promotion_index = 0;
function an_lamina(step) {
 var lamina = document.getElementById("lamina-content");
 if (lamina && lamina.childNodes) {

  var len = 0; // numero de LI nodos -- Opera, Mozilla consider blank space as a text node
  for (var i = 0; i < lamina.childNodes.length; i++) { if (lamina.childNodes[i].nodeName == "LI") len++; }
  if (len == 1) return;

  var new_index = promotion_index + step;
  if (new_index < 0) new_index = len-1;
  if (new_index >= len) new_index = 0;

  var c = 0;
  for (i = 0; i < lamina.childNodes.length; i++) {
   if(lamina.childNodes[i].nodeName == "LI") {
    if (promotion_index == c) { lamina.childNodes[i].style.display = "none"; }
    if (new_index == c) { lamina.childNodes[i].style.display = "block"; }
    c++;
   }
  }
  promotion_index = new_index;
 }
}