I have a question about my mouse...I got an iBook a couple days ago, and I really like it except for one thing--I've tried using a Logitech mouse and a Microsoft mouse (both optical) from previous computers, but they just seem to work poorly. It feels like there's a very slight lag when I'm using them. Like whenever I'm trying to click on something tiny, I have to go very slowly or else I'll overshoot. I've tried changing the mouse speeds, but doesn't fix it. Is there something I could do to fix this (buy an apple mouse?), or is this something I need to get used to (like I need to have more, uh, finesse with my hands

)? Thank you.