function showRandomSponsor() {
  var img = document.getElementById("x_image").getElementsByTagName("IMG");
  if (img.length) {
    var rand_no = Math.floor(img.length*Math.random());
    img[rand_no].style.display = "block";
  }
}

var docsPage = 0;
var docsPerPage = 5;
function initDocs(id) {
  var box = document.getElementsByClassName("itemBox", document.getElementById("docs"+id));
  var p = parseInt(box.length/docsPerPage)+1;
  var nav = document.getElementById("pnav"+id);
  var pa = '';
  for (var i = 0; i < p; i++) { 
    var xclass = '';
    if (!i) xclass ='current';
    pa += '<a class="x '+xclass+'" href="#" onclick="javascript:return docsGoto(\''+id+'\', '+(i+1)+', this)">'+(i+1)+'</a> ';
  }
  nav.innerHTML = pa;
  docsGoto(id, 1);
} 
function docsGoto(id, p, a) {
  var box = document.getElementsByClassName("itemBox", document.getElementById("docs"+id));
  p--;
  for (var i = 0; i < box.length; i++) {
    if (i >= p*docsPerPage && i <= (p*docsPerPage)+docsPerPage-1) {
      box[i].style.display = "block";
    } else {
      box[i].style.display = "none";
    }
  }
  if (a) {
    var aa = document.getElementById("pnav"+id).getElementsByTagName("A");
    for (var i = 0; i < aa.length; i++) {
      aa[i].className= "";
    }
    a.className = "current";
  } 
  return false;      
}