Here's the code:
HTML Code:
function moveElement(elementID,final_x,final_y,interval) { 
  if (!document.getElementById) return false; 
  if (!document.getElementById(elementID)) return false; 
  var elem = document.getElementById(elementID);
  if (elem.movement) { 
    clearTimeout(elem.movement);
  } 
  if (!elem.style.left) {
    elem.style.left = "0px";
  } 
  if (!elem.style.top) {
    elem.style.top = "0px";
  } 
  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 = Math.ceil((final_x - xpos)/10); 
    xpos = xpos + dist;
  } 

  if (xpos > final_x) {
    var dist = Math.ceil((xpos - final_x)/10); 
    xpos = xpos - dist;
  } 

  if (ypos < final_y) {
   var dist = Math.ceil((final_y - ypos)/10); 
   ypos = ypos + dist;
  } 

  if (ypos > final_y) {
   var dist = Math.ceil((ypos - final_y)/10); 
   ypos = ypos - dist;
  } 
  elem.style.left = xpos + "px"; 
  elem.style.top = ypos + "px"; 
  var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")"; 
  elem.movement = setTimeout(repeat,interval);
}
Now, what I don't understand is this :
HTML Code:
  var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")"; 
Why are there so many plus signs?
Thanks in advance.