Embedding (Local) Javsascript with Firefox Addon...

[acestuff]

I have a .js which I want my Firefox addon to embed into a page.

I've tried the below but it's not working:

var script = window.content.document.createElement("script");
	script.setAttribute("src", "chrome://file.js");
	script.setAttribute("type", "text/javascript");
	script.onload = function()	{
		// Onload script load events
	}
window.content.document.body.appendChild(script);

Anyone got any ideas?

Note:
I can't just run the .js "on the addon" so to speak because it includes references like "document.body" which when you write on an addon are "window.content.document.body", etc.
Is there a way around this?

[Padonak]

as i know Greasemonkey deals good with document.body

[acestuff]

as i know Greasemonkey deals good with document.body

Greasemonkey is a seperate addon though - I've made my own just need to solve this problem though. There has to be a simple embedding solution...