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Scroll div with "middle button" mouse instantly

I want to implement navigation in a website using the middle button function of scrolling ("clicking" (please re-read clicking) the middle button and roaming around the borders) but I would like this to happen instantly without the need for user input. Something of the kind:
$(element).mouseover(function(){
roamAround(); //I've tried SIMULATING (NOT <--- DETECTING)
//a middle-click from the mouse but failed
});
I am currently using google-chrome and at this stage of development I am not really concerned about cross-browsing this function. If it should work on chrome then it's fine.
What would be the best way to do this using native functions or emulation? Thank you very much!
EDIT: I don't want to DETECT user input, please re-read the question :)

Sounds like you want, like Deryck said, infinite scrolling. There's a jQuery plugin jScroll that does a simpler version for vertical content that can either be auto-loaded or loaded by a button press. You can view the code on Github to see how to do something similar, i.e. your roamAround function could mimic the _load function found there.

Creating a "box-webpage" upon click

I'm trying to accomplish something that might be relatively simple, but I don't know what I would call it (if there is a specific name for it), hence my searches have proved useless.
What I'm trying to accomplish is simple: I have a page built off off the Masonry jquery plugin (similar to http://designshack.net/tutorialexamples/masonry/demos/masonry.html). All I want to do is that when I click on a specific picture, it creates a "box" that fills up part of the screen and can contain another webpage (to describe the picture) while fading out most of the background. Then when I click outside of the box, it returns to all of my pictures.
I've seen this before, as I'm sure everybody else has, but for the life of me I cannot remember an example to look at or how best to do this. I don't have too much experience with javascript or jquery (which is why I'm asking this), but any help to point me in the right direction, whether it is using javascript or html/css, would be great.
If anybody does get the gist of what I'm describing and can explain it better, then you're more than welcome to edit..

What you need are modal windows.
I know the twitter bootstrap has built a pretty good framework for this:
http://getbootstrap.com/javascript/#modals
If you aren't using the bootstrap directly you might be able to pick out what you need.

JQuery pop up/ alert needed

I have a list of elements that need to have a corresponding pop up for each element. This is not a pop up where the background is blacked. This is more like a javascript alert although I need to create my own styled button within the pop up with our own bespoke event assigned to it. I need each pop to position itself appropriately next to the relevant item within the UI.
Whats the best way to do this? Are there any examples please? I only want the pop up to show when the visitor triggers an event.
Many thanks,

I suggest you to use Colorbox for pop-up systems. Fırst of all; it is easy to learn and use.
And most importantly: Colorbox won't create conflicts with your other plugins (sometimes fancybox does that).
Some Features:
Supports photos, grouping, slideshow, ajax, inline, and iframed
content.
Lightweight: 10KB of JavaScript (less than 5KBs gzipped).
Appearance is controlled through CSS so it can be restyled.

You can easily do this without using jQuery Plugins.
I put together a little example.

What about http://jqueryui.com/demos/dialog/#modal-confirmation
or http://jqueryui.com/demos/dialog/#modal-message

Can The Preview Pane in the MarkdownDeep Markdown Editor be Disabled?

I'm working on an ASP.NET MVC project which uses the MarkdownDeep Editor to add a rich editor on top of a basic markdown input textbox (very similar to the Stackoverflow editor window).
Generally it works great. However, in certain scenarios, I would like to disable the preview window. This is automatically generated below the textarea by MDD. Can this be disabled?
Just to be clear, I know I can use CSS to hide the preview. But on some devices it's slow and makes typing painful. I want to entirely turn off that feature. I don't see anything in the docs other than how to customize the preview.
Any ideas?

In the docs it specifically mentions that it is recommended that you have the div preview already in your document because it will be created if it isn't found and consequently, could could a visible page refresh if any re-layout has to occur.
Note: the associated divs are all optional and if missing, the plugin will create them. However... you might experience the page jumping around during load if you do this. ie: it's recommended to explicitly include them.
Thus from the sounds of this, and that there doesn't appear to be any option to turn it off in the API page I would say no, it's not possible.

I am a little confused here: if you don't want the preview, use a regular text area instead of mdd_editor... So, under the scenarios where you don't need the previews, instantiate a plain vanilla editor. What am I missing here?

I know this is old, but I was looking for something else on mdd. I recently had this same requirement.
Just comment out the code
// Update the DOM
if (this.m_divHtml)
this.m_divHtml.innerHTML=output;
in MarkdownDeepEditor.js

Creating a Login System like Battle.net

I'm trying to create a login system like http://us.battle.net/en/. The page is fully functional, then when you click on the "Log In" link, the page becomes dark and you can no longer interact with any of the images or links from the original page. A square box comes up, which you can interact with to login to the site, put you can still see everything from the original page.
I've been searching and searching and I can't find what I'm looking for. I just need some ideas to get me pointed in the right direction and I can go from there.
Thanks everyone!

Maybe something like jQuery UI Dialog could help you. Checkout the modal example.

Have a look into Colorbox - it's a jQuery plugin, very easy to use, and does exactly what you want.
The effect of graying out the page and showing a popup dialogue box is called a "modal" dialogue box.

I believe the functionality you are referring to is called a lightbox.
There are dozens of jQuery lightbox plugins around, a quick Google search suffices; FancyBox, for example, is a pretty nice one.