var slideTime = 500; 
var topMargin = 795;
var container;
var floater;
window.onload = function() {
  xAddEventListener(window, 'resize', winOnResize, false);
  xAddEventListener(window, 'scroll', winOnScroll, false);
  container = xGetElementById('container');
  floater = xGetElementById('floater');
  floater.style.left = xPageX(container);
  winOnResize(); 
  xShow(floater);
}
function winOnResize() {
  xMoveTo(floater, xPageX(container), topMargin);
}
function winOnScroll() {
  xSlideTo(floater, xLeft(floater), Math.max(topMargin, (xScrollTop()+730)), slideTime);
}