Funktion moveElement(elementID,final_x,final_y,interval) {

var elem = document.getElementById(elementID);
if(elem.movement){
    clearTimeout(elem.movement);
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) {
    xpos++;
}
if(xpos > final_x) {
    xpos--;
}
if(ypos < final_y) {
    ypos++;
}
if(ypos > final_x) {
    ypos--;
}
elem.style.left = xpos + "px";
elem.style.top = ypos + "px";
var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")"
elem.movement = setTimeout(repeat,interval);

}