Include the jquery file reference and WebSnowjq.js reference before calling WebSnowjq function.
<script src="//code.jquery.com/jquery-1.7.1.js"></script>
<script src="~/Scripts/WebSnowjq.js"></script>
<div id="divSnow"></div>
<script>
$("#divSnow").websnowjq();
</script>
Amount of snow flakes can be customized as per requirement.
<script src="//code.jquery.com/jquery-1.7.1.js"></script>
<script src="~/Scripts/Websnowjq.js"></script>
<div id="divSnow"></div>
<script>
$("#divSnow").websnowjq({ snowFlakes: 50 });
</script>