function moveElement(elementID,final_x,final_y,interval) {
  if (!document.getElementById) return false;
  if (!$(elementID)) return false;
  var elem = $(elementID);
  if (elem.movement) {
    clearTimeout(elem.movement);
  }
  if (!elem.style.left) {
    elem.style.left = "0em";
  }
  if (!elem.style.top) {
    elem.style.top = "0em";
  }
  var xpos = parseInt(elem.style.left);
  var ypos = parseInt(elem.style.top);
  if (xpos == final_x && ypos == final_y) {
    return true;
  }
  if (xpos < final_x) {
    var dist = (final_x - xpos);
    xpos = xpos + dist;
  }
  if (xpos > final_x) {
    var dist = (xpos - final_x);
    xpos = xpos - dist;
  }
  if (ypos < final_y) {
    var dist = (final_y - ypos);
    ypos = ypos + dist;
  }
  if (ypos > final_y) {
    var dist = (ypos - final_y);
    ypos = ypos - dist;
  }
  elem.style.left = xpos + "em";
  elem.style.top = ypos + "em";
	
  var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";
  elem.movement = setTimeout(repeat,interval);


}