// javascript scripts for Gallery

var i = 0;
var pc = 14;

function Init(initial_id){
  
  if (initial_id < 1 || initial_id > pc){
    initial_id = 1;
  }

  GetNewPic(0, initial_id);
  i = initial_id;

}

function GetNewPic(old_id, new_id){

  oldPic = document.getElementById("galleryPic_" + old_id);
  newPic = document.getElementById("galleryPic_" + new_id);

  oldPic.style.display="none";
  oldPic.style.visibility="hidden";

  newPic.style.display="block";
  newPic.style.visibility="visible";

}

function GetNextPic(){

  var j = i+1;
  if (j>pc){
    j = 1;
  }

  GetNewPic(i, j);
  i = j;
  

}

function GetPrevPic(){

  var j = i-1;
  if (j<1){
    j = pc;
  }
  
  GetNewPic(i, j);
  i = j;
}