Calling a HTML PS Object (Javascript) from an HTML Area on a Page

Hello All,

We are stuck and would love some help if anyone has experience in this.  I have a comment field on a page, and an HTML area right next to the comment field.  Orginally I had Javascript in the HTML area to monitor the comment field.  What it did was count down the number of characters left the user had to populate the field, so it was a counter.  What I want to do is move that Javascript to a central location so other HTML areas can reference the code (as we have many comments boxes in our environment.  So what