// JavaScript Document
function fly() {
  var speed_x = 3;
  var speed_y = 0;
  var delay = 20;
  var rightValue = (parseInt(document.getElementById('flyingDiv').style.right) + speed_x) + 'px';
  var topValue = (parseInt(document.getElementById('flyingDiv').style.top) + speed_y) + 'px';
  document.getElementById('flyingDiv').style.right = rightValue;
  document.getElementById('flyingDiv').style.top = topValue;
  setTimeout( "fly()", delay );
}