Yahoo messenger side bar (explorer bar) ?

Hey all,
I found something in IE the other day that I really liked but can't seem to find the same for Firefox which is what I mostly use.
In IE, under explorer bars, you have the option of yahoo messenger. So, it slaps your messenger window as the lefthand side like a bookmark or history eplorer bar.

Problem is this: I can't find the same thing for Firefox. Does anyone know if that even is available for Mozilla or if it's only an IE thing????
I use a widescreen laptop so having that in the side works out great. I'd just rather use Firefox.

Any help on this would relieve me of so much torture.
Thanx in advance if anyone has answers for me.

I still use IE.. firefox has it's own share of problems.. The only good thing I like about Firefox is it's tabbed browsing which IE is coming out with shortly.