How Can I Run Scripts From Buttons On The Application Dashboard?

OK, I got the MyIfile.html file, copied it to a code page named MyIfile.html and created a webpage on my dashboard.  I created a button with the URL for my xxxx.js page, but when I load the homepage, the web widget just displays a webpage with the MyIfile.html code.  I'll keep after it, but if you know what I'm doing wrong, please chime in.  Thank you!