// List image names without extension
// NOTE: galleries are 1-4, Array is 0-3 !!!
gallery= new Array(0,0);
gallery[0]=["gb_1.jpg","gb_2.jpg","gb_3.jpg","gb_4.jpg"];
gallery[1]=["wuc_1.jpg","wuc_2.jpg","wuc_3.jpg","wuc_4.jpg","wuc_5.jpg","wuc_6.jpg","wuc_7.jpg","wuc_8.jpg","wuc_9.jpg","wuc_10.jpg","wuc_11.jpg","wuc_12.jpg","wuc_13.jpg","wuc_14.jpg","wuc_15.jpg"];
gallery[2]=["s2l_7.jpg","s2l_1.jpg","s2l_2.jpg","s2l_3.jpg","s2l_4.jpg","s2l_5.jpg","s2l_6.jpg","s2l_8.jpg"];
gallery[3]=["sitan_1.jpg","sitan_2.jpg","sitan_3.jpg","sitan_4.jpg","sitan_5.jpg","sitan_6.jpg"];



// function to initialize gallery when its page opens
function initGallery(index){
	i = 0;
	loadImg(index);
}

// function to load image
function loadImg(index){
  document.getElementById("pic"+index).src = "gallery/gallery"+index+"/" + gallery[index-1][i];
}

// function to switch image backward
function prev(index){
  if(i<1){
    i=gallery[index-1].length-1;
  } else {
    i=i-1;
  }
  loadImg(index);
}

// function to switch image forward
function next(index){
  if(i>gallery[index-1].length-2){
    i=0;
  } else {
    i=i+1;
  }
  loadImg(index);
}

// function to show navigation
function showNav (index) {
	document.getElementById('next'+index).src="gallery/right.gif";
	document.getElementById('previous'+index).src="gallery/left.gif";
}
// function to hide navigation
function hideNav (index) {
	document.getElementById('next'+index).src="gallery/none.gif";
	document.getElementById('previous'+index).src="gallery/none.gif";
}