As to VSD, it's (usually) pretty easy to add scripts and code snippets to it. Seems a lot of things come in 3 sections:
1. Some code for the header (Edit > edit Header – copy/paste the code here)
2. Your files (Edit > Add Files – lets you browse to your file, click to add)
3. Code for the actual page/body (use the HTML tool to drag out a box on the page, then paste code in it)
Then there'll be some adjusting to get the positioning just right, but that's a quick overview for you

That was actually a very good summing up what to do in VSD!

Inger, Norway
My work in progress:
Components for Site Designer and the HTML Editor: https://mock-up.coffeecup.com