A single Javascript reference in the <head> tag is required for SnowStorm to work.
As well, some customized options are specified which override the SnowStorm defaults.
View the source of this page for reference.
<!-- required snowstorm JS, default behaviour --> <script type="text/javascript" src="snowstorm.js"></script> <!-- now, we'll customize the snowStorm object --> <script type="text/javascript"> snowStorm.snowColor = '#99ccff'; // blue-ish snow!? snowStorm.flakesMaxActive = 96; // show more snow on screen at once snowStorm.useTwinkleEffect = true; // let the snow flicker in and out of view </script>