var x = 0; //Starting Location - left
            var y = 280; //Starting Location - top
            var dest_x = 0;  //Ending Location - left
            var dest_y = 1560;  //Ending Location - top
            var interval = 5; //Move 10px every initialization
            var action='top';

            function moveImage() {
                var ad=document.getElementById("ad");
                ad.style.display ="block";
                switch (action) {
                    case 'top':
                        if(x<dest_x) x = x + interval;
                        ad.style.left = x+'px';
                        if ((x+interval <= dest_x)) {
                            window.setTimeout('moveImage()',70);
                        }else{
                            action='right';
                            dest_y = 1560;
                            window.setTimeout('moveImage()',70);
                        }
                        break;
                    case 'right':
                        if(y<dest_y) y = y + interval;
                        ad.style.top = y+'px';
                        if ((y+interval <= dest_y)) {
                            window.setTimeout('moveImage()',70);
                        }else{
                            action='bottom';
                            dest_x = 0;
                            window.setTimeout('moveImage()',70);
                        }
                        break;
                    case 'bottom':
                        if(x>dest_x) x = x - interval;
                        ad.style.left = x+'px';
                        if ((x-interval > dest_x)) {
                            window.setTimeout('moveImage()',70);
                        }else{
                            action='left';
                            dest_y = 280;
                            window.setTimeout('moveImage()',70);
                        }
                        break;
                    case 'left':
                        if(y>dest_y) y = y - interval;
                        ad.style.top = y+'px';
                        if ((y-interval > dest_y)) {
                            window.setTimeout('moveImage()',70);
                        }else{
                            action='top';
                            x=0;
                            dest_x = 0;
                            ad.style.display ="none";
                            window.setTimeout('moveImage()',10000);
                        }
                        break;
                    default:
                        break;
                }
            }