$(window).scroll(function () {
  var scrollTop = $(window).scrollTop();
  var height = $(window).height();
  var width = $(window).width();

  var vartop = height - 220;
  vartop = vartop + scrollTop;

  width = ((width - 790) / 2) + 790;

  if ($get("divPopupButton") != null) {
    $get("divPopupButton").style.position = "absolute";
    $get("divPopupButton").style.top = vartop + "px";
    $get("divPopupButton").style.left = width + "px";
  }
});


$(window).resize(function () {
  var scrollTop = $(window).scrollTop();
  var height = $(window).height();
  var width = $(window).width();

  var vartop = height - 220;
  vartop = vartop + scrollTop;

  width = ((width - 790) / 2) + 790;

  if ($get("divPopupButton") != null) {
    $get("divPopupButton").style.position = "absolute";
    $get("divPopupButton").style.top = vartop + "px";
    $get("divPopupButton").style.left = width + "px";
  }
});


$(document).ready(function () {
  var scrollTop = $(window).scrollTop();
  var height = $(window).height();
  var width = $(window).width();

  var vartop = height - 220;
  vartop = vartop + scrollTop;

  width = ((width - 790) / 2) + 790;

  if ($get("divPopupButton") != null) {
    $get("divPopupButton").style.position = "absolute";
    $get("divPopupButton").style.top = vartop + "px";
    $get("divPopupButton").style.left = width + "px";
  }
});