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Load External Custom Page and Execute Custom CSS or Javascript on The page

i'm building an online document portal that supports all Microsoft Office formats.
Instead of building my own module, i'm utilizing Google Docs Online Viewer since it already handles
this task properly, my only problem is it loads the header toolbar, which i dont want.
take for example This custom pdf-URL(i just googled for any pdf document), The navigation toolbar at the foot, but the header toobar, i want it hidden - all within the iFrame.
https://docs.google.com/viewer?url=http://www.scorpioncomputerservices.com/Press%20Coverage/Billgates.doc&embedded=false&controls=false
After Inspecting the Element on Chrome, i found the section of code controlling the element, problem is, how to hide this element on page load, by forcing a script/style to be executed on the page, while loading.
i would like to know if there's a way i could force-delete or hide the element controlling the toolbar within the iFrame, or better still if there are any alternatives to what i intend to do. my code would have looked like this
var obj = iframe.document.querySelectorAll('[role="toolbar"]');
obj.parentNode.removeElement(obj);
// or - i'm not sure anyof this would work.. and since it is loaded inside an iframe
// how do i execute this.
obj.remove();
i dont want my audience to be able to download the document, obviously curious developers might find a way, but thats going to be less than 2% - 5% of the total users.
how do i go about this please using javascript/CSS/or any library.

If you change the GET variable embedded to true the viewer won't display the top bar, however there's no way to edit the page inside the iFrame as Google has enabled cross site protection so the browser will prevent you from running any javascript to modify the content of the iFrame.
The only way to use the google document viewer is to get your site to load it in the background (not using an iFrame) and modify it before serving the page to the user.
Or alternitively I reccommend using an open source JS PDF viewer such as ViewerJS

Smooth page transition like Youtube

I'm very interesting with Youtube page transition. When you open a video, then move to another video that have different URL. The browser page not refreshed like usually when open a conventional web pages. It's just like you are not move to another page, you are in the same page whereas not.
Is there any javascript/jquery plugin to do this?

If you're wondering how to load content and not reload/refresh a webpage, then you'll be referring to Ajax (Asynchronous JavaScript and XML).
These should help you out:
Ajax W3C
jQuery Ajax

Open two iframes without full reload of the second iframe

I have an AngularJS application which runs under an iframe in a different website. I have the code of the website.
I need to open a new iframe to the same AngularJS application but to a different route. I don't want to load all the application again in the new iframe. I am looking for something that will duplicate existing instance of a window content, or maybe open a new iframe of the same application without loading the whole app again.
Here is the code explanation:
I have this html page:
<div>
<iframe src="www.myapp.com/books"></iframe>
</div>
www.myapp.com/books is an AngularJS application so it loads a lot of dependencies, execute a lot of code and make a few backend calls. I want to add a button that it's click will open another iframe to the html page:
<div>
<iframe src="www.myapp.com/books"></iframe>
<iframe src="www.myapp.com/names"></iframe>
</div>
The new iframe will open the same app but different route. Unfortunately this will cause a full loading of the application for the same iframe, and I am looking for a way to prevent this. Like cloning the same instance of the iframe and route to the new location without a full reload..
Any idea?

Lets talk JQuery on this one.
Say you have your nice iframe (iframes aren't actually very nice) element
<iframe id="original" src="www.myapp.com/books"></iframe>
take note of the id tag.
then you got your javascript, enclosed in tags
var newIframe = $("#original").clone();
$("body").append(newIframe);
LINK ---> Check this all out at JSFiddle <--- LINK!

The best thing to do is probably write the html/javascript/css of your application as text in the second iframe.
You can get the contents of the first iframe
page=$("#iframe1")).contents().find("html").html();
and then set it to your second iframe
var doc = parent.$("#iframe2")[0].documentElement;
doc.open();
doc.write(html);
doc.close();
You may not want to do a full copy like this, but I think this is a starting point.
I think it's mandatory that your application resides on the same domain of the website hosting it, or this will fail for cross-domain scripting security reasons. You would have to change the design of the whole thing if so, since you cannot manipulate an iframe on a different domain.
Information taken from How to insert html in iframe and Getting the html content of an iframe using jQuery
EDIT
What you want is probably not iframes. You can load the javascript for your application once in the main webpage. Then that javascript should download (or create) html elements, and inject them into a div. Doing so, the javascript for your application can manage as many subframes you want. The downside is that you must probably change a lot your application: now it is designed to be loaded as a webpage, and should be rewritten to be a js that manages some divs putting content into them. I don't see another solution, unfortunately.

How do you change the URL in the address bar without reloading the page?

How does Shopify do this? Go to their website, click on the Features link and you'll see that the URL in your browser's address bar says:
http://www.shopify.com/tour/sell-online
Then click on any of the sub links and you'll see that the URL in the address bar changes without using a hash and there is no page flip.
I don't think they are using ajax to change the content because it all appears to be included in hidden divs on the page, but regardless, you can apparently change the URL using client side tricks. Your help is appreciated?

You use the new HTML5 history API to push a new state.
Here's the MDN documentation and a good tutorial.
Beware that doing this is often painful (you have to manage correctly the state of your application) and it doesn't work with IE9. It's almost always combined with ajax : it's the solution to let dynamically loaded content be bookmarkable even while the whole page isn't reloaded or changed.

Look into pushState, but be aware it's not supported in all browsers.

Loading offsite content with AJAX

I'm building a PHP page that will load some off site content into a DIV. There are other static elements on the page also. The problem I'm having is that the page takes too long to load because PHP loads the off site content before displaying the page.
I am considering loading the off site content in the DIV via AJAX. I'm assuming the rest of the page would load regardless of how long it takes the AJAX DIV to load.
The content will not need to update or change while the original page is loaded. It just needs to load the content once.
I have been searching for a while and have found a lot of different techniques for doing this. Such as jQuery.
Do you have any suggestions on how to do this?
Any links to tutorials would be great.
Thanks

I guess this can help you:
$('#result').load('ajax/test.html');
Reference: jquery

If you control the second (off-site) domain, you can get around the same-origin policy issues by loading a script on the secondary domain. That script should kick off the various AJAXish content updates you want.
on example1.com:
<div id="stuff-from-example2"></div>
<script src="http://www.example2.com/js/stuff.js"></script>
in stuff.js:
$('#stuff-from-exampl2").load('http://www.example2.com/fragment.html');

You can get around the same-origin policy by loading the data using JSONP.
Here are the JQuery docs