/*
 * jQuery.appear
 * http://code.google.com/p/jquery-appear/
 *
 * Copyright (c) 2009 Michael Hixson
 * Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php)
 */
(function ($) {
  $.fn.appear = function (f, o) {
    var s = $.extend({ one: true }, o);
    return this.each(function () {
      var t = $(this);
      t.appeared = false;
      if (!f) {
        t.trigger("appear", s.data);
        return;
      }
      var w = $(window);
      var c = function () {
        if (!t.is(":visible")) {
          t.appeared = false;
          return;
        }
        var a = w.scrollLeft();
        var b = w.scrollTop();
        var o = t.offset();
        var x = o.left;
        var y = o.top;
        if (
          y + t.height() >= b &&
          y <= b + w.height() &&
          x + t.width() >= a &&
          x <= a + w.width()
        ) {
          if (!t.appeared) t.trigger("appear", s.data);
        } else {
          t.appeared = false;
        }
      };
      var m = function () {
        t.appeared = true;
        if (s.one) {
          w.unbind("scroll", c);
          var i = $.inArray(c, $.fn.appear.checks);
          if (i >= 0) $.fn.appear.checks.splice(i, 1);
        }
        f.apply(this, arguments);
      };
      if (s.one) t.one("appear", s.data, m);
      else t.bind("appear", s.data, m);
      w.scroll(c);
      $.fn.appear.checks.push(c);
      c();
    });
  };
  $.extend($.fn.appear, {
    checks: [],
    timeout: null,
    checkAll: function() {
		var length = $.fn.appear.checks.length;
		if (length > 0) {
			while (length--) {
				try {
					($.fn.appear.checks[length])();
				} catch (e) {}
			}
		}
	}, 
    run: function () {
      if ($.fn.appear.timeout) clearTimeout($.fn.appear.timeout);
      $.fn.appear.timeout = setTimeout($.fn.appear.checkAll, 20);
    },
  });
  $.each(
    [
      "append",
      "prepend",
      "after",
      "before",
      "attr",
      "removeAttr",
      "addClass",
      "removeClass",
      "toggleClass",
      "remove",
      "css",
      "show",
      "hide",
    ],
    function (i, n) {
      var u = $.fn[n];
      if (u) {
        $.fn[n] = function () {
          var r = u.apply(this, arguments);
          $.fn.appear.run();
          return r;
        };
      }
    }
  );
})(jQuery);