Javascript in a page

Hi. I am trying to get a marquee of images with links inserted into my page. I tried several html codes and they weren’t “continuous”. I was able to get a javascript code that I think will work. I created a .js file with that code. I have a headspace plugin so where it says javascript I added what I thought I was supposed to. I went to my page (http://giveaways4mommy.com/?page_id=45) and viewed the source and indeed saw my javascript file in the header. Now I need to add it into my page. I thought I would just type in the same thing that was in my header and it would bring it up. I’m thinking that’s not right. What do I need to type into the actual page? I’ve tried to read up on this and wondered about using exec-php but I have no idea how to do it. Html I am starting to understand. Javascript…not so much.