just to add to tsuji's post.
VB/VB Script only really work in a totally IE centric world. (A company Intra-net.)
I am a VB Programmer, but find myself needing to do things at the client side - the web browser. This has caused me to learn javascript (which is different to jscipt - and firefox doesn't understand jscript)
Once you get used to its rules (Semi colon at the end of most lines. Squiggly brackets etc) it is pretty easy. I found loops and if's to be the hardest concepts to wrap my limited brain around.
However.. IT is very powerful, and things that had caused me to write Ajax methods in dot net, now I do in JavaScript - (Or most specifically I have been using the JQuery library to accelerate Client side development-which uses JavaScript)
When ever I have a problem, I go to
or
The top link provides a great edit and play environment and the bottom is documentation and source code for jquery. (A free download)
- Also - Firefox isn't really that much more secure than IE. INfact unless people are updating it, it is probably less secure. IE gets the weekly update from MS, so as soon as a vulnerability is found, it gets plugged. Firefox doesn't get that sort of treatment. (This should start a browser love/hate war

- personally I hate the way firefox will often be the only browser that doesn't display a page in an anticipated way, but then sometimes it is IE that falls into that trap, and IE6... spawn of satin.. (crap now I sound like a firefox person ) hahaha
It is kind of like Linux. If you hate Microsoft - it is the best product in the world.
My 1c
HTH
Rob