var curLayer=1;
var printHref="";

function showL(i,u){
  if (curLayer!=i){
    hideCurLayer();
    curLayer=i;
    showCurLayer();
    if (u!="") location.href=u;
  }
}

function hideCurLayer(){
  obj = document.getElementById("l"+curLayer);
  if (obj){
    obj.style.visibility="hidden";
  }
  obj = document.getElementById("s"+curLayer);
  if (obj){
    obj.style.color="#ffffff";
  }
}

function showCurLayer(){
  obj = document.getElementById("l"+curLayer);
  if (obj){
    obj.style.visibility="visible";
  }
  obj = document.getElementById("s"+curLayer);
  if (obj){
    obj.style.color="#ffcc00";
  }
  setPrintHref();
}

function setPrintHref(){
  for(i=0;i<document.anchors.length;i++){
    if (document.anchors[i].name=="curChapter"){
      if (printHref==""){printHref=document.anchors[i].href;}
      document.anchors[i].href=printHref+"&printId="+curLayer;
    }
  }
}

function prev(u){
  if (curLayer>1){
    showL(curLayer-1,u)
  }
}

function next(u){
  obj = document.getElementById("l"+(curLayer+1));
  if (obj){
    showL(curLayer+1,u)
  }
}