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Is there an equivalent to $.getScript that removes or replaces a javascript file?

I am dynamically loading javascript files into an HTML document via $.getScript. I would like to remove and or replace the old dynamically loaded files variables and functions each time I add a new one. Is this possible with just jQuery? One of my friends suggested I use Ajax. Is that necessary, and if so, how would I go about doing so?
Thanks!
(I can provide code if need be, but I don't see why it would be necessary)

passing css to new page using javascript not working

I am building a string comparer using diffjs library and want to display the resultant table in a new page using javascript.
Although I can see the table on a new window and also able to passed the css and js script on the new window (as they are there in the inspect element tab of the browser) but till css is not working and I see only plain text.
I have used w.document.getElementsByTagName("head")[0].appendChild(cssNode);to pass css and respective javascripts to pass js and css to new window

I'm not sure,but maybe wrap it into style tags.
w.document.getElementsByTagName("head")[0].appendChild("<style>"+cssNode+"</style>");

Load file into QwebView

I need to create function to create advertisement here: http://www.motosale.com.ua/?add=zap
In this adv. should be image.
I have decided to create QWebView and insert each field by javascript. But i can't insert file.
How can i do that?
self.webView.page().mainFrame().evaluateJavaScript("document.getElementsByName('model_zap')[0].value='57'")
I did inserting values to inputs in that way

Maybe to try with QGraphicsWebView() instead of QwebView() ?

Trigger an Event in javascript before objects finish to load

I was trying to write a global JavaScriptfunction which overrides any HTML object (img, iframe, links and so on) before it being loaded by the page. The purpose of the overiding action was to to change the SRC and HREF of these objects using the DOM to any other link.
Unfortunately I didn't find any solution to that without firstly loading the object and only then changing it by the onload event.
My second option was to change the SRC and HREF by matching these attributes with a regular expression and replacing the resultant values. I prefer not to do so because it's slow and consumes a lot of time.
I would be glad if someone can share with his/her experience and help me solve this out.

JavaScript only works within the DOM.
You could however, load the page via AJAX, get the content and do any string manipulation on it.

If you are trying to modify items that exist in the static HTML of the page, you cannot modify them with javascript until they are successfully loaded by the browser. There is no way to modify them before that. They may or may not be visible to the viewer before you have a chance to modify them.
To solve this issue, there are a couple of options.
Put CSS style rules in the page that causes all items that you want to modify to initially be hidden and then your javascript can modify them and then show them so they will not be seen before your modification.
Don't put the items that you want to modify in the static part of your HTML page. You can either create them programmatically with javascript and insert them into the page or you can load them via ajax, modify them after loading them via ajax and then insert them into the page.
For both of these scenarios, you will have to devise a fallback plan if javascript is not enabled.

getting a div from an iframe pure javascript

I am using this piece of code to copy the value of on div to another. The problem is that the "listprice" div is inside the iframe that is being loaded by the page that has v4-25 in it. Do you think there is a way to actually acces the "listprice" from that iframe?
I can't use any library for that, it has to be pure javascript.
var string = document.getElementById('v4-25').innerHTML;
document.getElementById('listprice').innerHTML = string;
Thank you,
H

window.frames[framename].document.getElementById("listprice")

See this question How to Access a DIV inside a iframe from a Parent See this answer, it demonstrates how to access the element across an iframe using plain JavaScript.