Question

I have partial control of a web page where by I can enter snippets of code at various places, but I cannot remove any preexisting code.

There is a script reference midway through the page

<script src="/unwanted.js" type="text/javascript"></script> 

but I do not want the script to load. I cannot access the unwanted.js file. Is there anyway I can use javascript executing above this refernce to cause the unwanted.js file not to load?

Edit: To answer the comments asking what and why:

I’m setting up a Stack Exchange site and the WMD* js file loads halfway down the page. SE will allow you to insert HTML in various parts of the page – so you can have your custom header and footer etc. I want to override the standard WMD code with my own version of it.
I can get around the problem by just loading javascript after the original WMD script loads and replacing the functions with my own – but it would be nice not to have such a large chunk of JS load needlessly.

*WMD = the mark down editor used here at SO, and on the SE sites.

Answer 1

In short, you can’t. Even if there is a hack, it would heavily depend on the way browsers parse the HTML and load the scripts and hence wouldn’t be compatible with all browsers.