I read a tutorial on how you can completely change the scrollbar's colors and stuff in css, I did the tutorial, nothing changed ( I was using IFRAME ), then I copy and pasted the code, and even that didn't work. So tell me.

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Could you provide a link to the tutorial?

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Wax on, Wax off

I know many browsers disable the customisation of scrollbars by default. Firefox 1.x and above is one of these browsers, I think (if supported at all).

The following page may be of some interest. I don't know how relevant it is.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.

You can only change th scroll color in IE, and I think that is only IE6.

I think Wildhoney just answered that question/problem. :)

As he said, you can change the variable in the "about:config" from firefox and make it changeable. You can also use a AJAX system for it.

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"Life is a bitch, take that bitch on a ride"

As Aaron already said, scrollbar colors are only supported by IE and partially by Opera. Quirksmode has a good browser support list that verifies that statement.

If you want a crossbrowser solution you should use javascript, i.e. flexscroll, scroller.js using the prototype library or jScrollPane for jQuery.