// JavaScript Document
function getPageCoords (element) {
  var coords = {x: 0, y: 0};
  while (element) {
    coords.x += element.offsetLeft;
    coords.y += element.offsetTop;
    element = element.offsetParent;
  }
  return coords;
}
function getOffsets (evt) {
  if (typeof evt.offsetX != 'undefined')
    return { x: evt.offsetX, y: evt.offsetY }
  else if (evt.target) {
    if (window.opera)
      var element = evt.target;
    else
      var element = evt.target.nodeType == 1 ? evt.target : 
evt.target.parentNode;
    var eventCoords = {
      x: evt.clientX + window.pageXOffset,
      y: evt.clientY + window.pageYOffset
    };
    var elCoords = getPageCoords(element);
    return {x: eventCoords.x - elCoords.x, y: eventCoords.y - 
elCoords.y};
  }
}