On 3 Apr 2007 01:50:12 -0700, Piotr.Czechumski@gmail.com
wrote:
> var Tag = window.document.getElementById('worktoolbar');

Note, "Tag" starts with a capital letter. Also, you can just use
document.getElementById (as document == window.document).

>
> if (Tag)
> {
> tag.setAttribute("style",newStyle);

Here "tag" is all-lowercase.

>

Is this a browser.xul overlay? This id-less will create a
new and append it to the end of the master document, instead
of inserting toolbars in the existing toolbox. Is that what you want?

After fixing the above problems check if you have the with
the right id in the DOM inspector.

> Problem is that getElementById always returns me null!!!
>
> Where is my error?
>
And if you still can't figure it out, post the exact code you're using
and the exact error message.

Also, changing the background color might not work unless you reset
-moz-appearance to none for the element.

> PS Is it posible to run java (not javascript) program from firefox
> extension?
>
The question is not clear. You can run external executables, there's
JavaXPCOM (which I believe is not enabled in Firefox), and there's
another way mentioned on MDC (searching it for "Java" should help).

Nickolay