(function () {
	var _int_snow = function () {
		debugger;
		var
			size_min = (typeof (snow_size_min) != 'undefined') ? snow_size_min : 8,
			size_max = (typeof (snow_size_max) != 'undefined') ? snow_size_max : 20,
			num_flakes = (typeof (snow_num_flakes) != 'undefined') ? snow_num_flakes : 30,
			horiz_start = (typeof (snow_horiz_start) != 'undefined') ? snow_horiz_start : 0,
			horiz_end =
				(typeof (snow_horiz_end) != 'undefined') ?
				snow_horiz_end :
				(document.body.clientWidth || document.body.innerWidth || document.body.offsetWidth),
			vert_start = (typeof (snow_vert_start) != 'undefined') ? snow_vert_start : 0,
			vert_end =
				(typeof (snow_vert_end) != 'undefined') ?
				snow_vert_end :
				(document.body.clientHeight || document.body.innerHeight || document.body.offsetHeight),
			flake_image = (typeof (snow_flake_image) != 'undefined') ? snow_flake_image : null,
			flake_color = (typeof (snow_flake_color) != 'undefined') ? snow_flake_color : '#A0A0A0',
			fall_speed = (typeof (snow_fall_speed) != 'undefined') ? snow_fall_speed : 20,
			flake_objects = [],
			flakes_per_ms = num_flakes * fall_speed / (vert_end - vert_start) / 1000,
			flakes_limit = 0,
			time_start = new Date ().getTime ();

		setInterval (
			function () {
				var _int_flake_move = function (time_current) {
					var i, one_flake, time_diff;

					for (i = 0; i < flake_objects.length; ++i) {
						one_flake = flake_objects [i];
						time_diff = time_current - one_flake.time_start;
						one_flake.pos_vert_current = one_flake.pos_vert_start + time_diff * fall_speed / 1000;
						one_flake.dom.style.top = one_flake.pos_vert_current + 'px';
						one_flake.pos_horiz_current += Math.floor (Math.random () * 3 - 1);
						if (one_flake.pos_horiz_current < horiz_start) {
							one_flake.pos_horiz_current = horiz_start;
						} else if (one_flake.pos_horiz_current + one_flake.size > horiz_end) {
							one_flake.pos_horiz_current = horiz_end - one_flake.size;
						}
						one_flake.dom.style.left = one_flake.pos_horiz_current + 'px';
					}
				};

				var _int_flake_cleanup = function () {
					var limit;

					limit = vert_end - size_max;
					while (flake_objects.length && (flake_objects [0].pos_vert_current >= limit)) {
						document.body.removeChild (flake_objects [0].dom);
						flake_objects.shift ();
					}
				};

				var _int_flake_add = function (time_current) {
					var current_size, current_flake, px_size, pos_horiz, pos_vert;

					current_size = Math.floor (Math.random () * (size_max - size_min + 1)) + size_min;
					px_size = current_size + 'px';
					pos_horiz = Math.random () * (horiz_end - horiz_start - current_size + 1) + horiz_start;
					pos_vert = vert_start || -current_size;
					if (flake_image !== null) {
						one_flake = document.createElement ('img');
						one_flake.src = flake_image;
						one_flake.style.display = 'block';
					} else {
						one_flake = document.createElement ('div');
						one_flake.appendChild (document.createTextNode ('*'));
						one_flake.style.color = flake_color;
						one_flake.style.fontSize = px_size;
					}
					one_flake.style.position = 'absolute';
					one_flake.style.zIndex = '1000000';
					one_flake.style.width = px_size;
					one_flake.style.height = px_size;
					one_flake.style.top = pos_vert + 'px';
					one_flake.style.left = pos_horiz + 'px';
					flake_objects.push ({
						dom: one_flake,
						size: current_size,
						time_start: time_current,
						pos_horiz_current: pos_horiz,
						pos_vert_start: pos_vert,
						pos_vert_current: pos_vert
					});
					document.body.appendChild (one_flake);
				};

				var time_current, flakes_limit, flakes_active;

				time_current = new Date ().getTime ();
				_int_flake_move (time_current);
				_int_flake_cleanup ();
				flakes_limit = Math.floor ((time_current - time_start) * flakes_per_ms) + 1;
				for (;;) {
					flakes_active = flake_objects.length;
					if ((flakes_active >= flakes_limit) || (flakes_active >= num_flakes)) {
						break;
					}
					_int_flake_add (time_current);
				}
			},
			100
		);
	};

	if ('addEventListener' in window) {
		window.addEventListener ('load', _int_snow, false);
	} else if ('attachEvent' in document) {
		window.attachEvent ('onload', _int_snow);
	} else {
		window.onload = _int_snow;
	}
}) ();