I found the JS file online, and uploaded it to the OP's server, and added the script via a plugin, and it works right out of the box with no additional HTML needed.
Inked_Mono, if you don't like this particular effect, simply delete the plugin titled "Add Snowstorm" and delete the file "clientscript/snowstorm.js" from your server.
Thank you so much for your help! I know it was quite the struggle. As mentioned in the PM, you need only let me know the answer to what I was offering.