Newbie trying to use javascript in website templates

I keep reading from the message board that I can use javascript in my NetSuite website templates, however, when I try it I always run into problems.  I must be missing something.
Here is an example of something I'm trying, if anyone can see what I'm doing wrong I would really appreciate it.

In my related items template, I want to display a row that shows the add to cart button unless the itemid = 216 (I planned on getting more sophisticated, but for my first test, was just using an itemid, but can't even get that working.)  I already had the <tr><td><table.... stuff that's in my document.write statement working.  To try to not show it if itemid=216, I added the <script> tags, got the internalid, did an alert for testing, then if not =216 display everything in a document.write.