In the console I received the following error:
Uncaught TypeError: Object [object Object] has no method 'galleria'
This error lead me to believe that you were initializing the Galleria plugin incorrectly. In your code you're using the following:
$("div.slide").galleria();
I jumped over to their website and took a gander at their documentation. It appears that they recommend you do the following to initialize Galleria.
Galleria.run('#galleria');
or in your case it would be Galleria.run('div.slide');
On another note, I noticed that you've included three separate JavaScript libraries/frameworks (Prototype, Scriptaculous, and jQuery) on your website. This might cause some hiccups/conflicts between the libraries.
Also, you specify the options separately from initializing this plugin. Here's the code you'll need to initialize the plugin and configure it as you'd like:
var jQ = jQuery.noConflict();
jQ(function(){
Galleria.loadTheme('galleria/themes/classic/galleria.classic.min.js');
Galleria.run('div.slide');
Galleria.configure({
width:1400,
height:620,
transition: 'fade',
showInfo: false,
autoplay: 4000,
lightbox:true,
showImagenav:false,
imageCrop:'landscape',
thumbnails:false
});
});