Can anybody help me to attach the following java script code in Articulate Storyline on single page?

I am attaching the the java script code of snow falling, but problem is that I want it on single slide, I have tried to add by updating story.html, but its showing on all the slides of project. I just need to apply attached java script code on single slide.

I had used below method and because of this it appearing on the all the slides.

<script LANGUAGE="JavaScript1.2" SRC="story_content/MyJavaScriptFunctions.js" TYPE="text/javascript"></script>

 

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