function openWindow(elem, elemholder)
{
  // Set the correct height of the overlay
  var overlay = document.getElementById('popupoverlay');
  overlay.style.height = document.body.scrollHeight + "px";
  overlay.style.top = document.body.scrollTop + "px";
//alert(document.body.scrollTop);
  overlay.style.display = "block";

  document.getElementById('newspopupholder').style.display = "block";

  var popupWindow = document.getElementById(elem);
  popupWindow.style.display = "block";
  opacity(elem, 0, 100, 500);

  lastOpenedPopup = elem;

  return false;
}

function closeWindow(elem)
{
  var popupWindow = document.getElementById(elem);
  popupWindow.style.display = "none";
  changeOpac(0, elem);

  document.getElementById('popupoverlay').style.display = "none";
  document.getElementById('newspopupholder').style.display = "none";

  return false;
}

function closePopupBox()
{
  closeWindow(lastOpenedPopup);
}

function opacity(id, opacStart, opacEnd, millisec) {
    //speed for each frame
    var speed = Math.round(millisec / 100);
    var timer = 0;

    //determine the direction for the blending, if start and end are the same nothing happens
    if(opacStart > opacEnd) {
        for(i = opacStart; i >= opacEnd; i--) {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    } else if(opacStart < opacEnd) {
        for(i = opacStart; i <= opacEnd; i++)
            {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    }
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}