So I'm pretty new to web design and Dreamweaver, but I've managed to put something fairly solid together. The only problem I'm having is that my two main javascripts for images - one slider and one lightbox gallery - are canceling each other out. If one works, the other cannot. Here's the code at the head. Any advice?

Code:
  <link rel="stylesheet" href="http://bytes.com/nivo-slider/themes/default/default.css" type="text/css"
...