[CentOS] Wierd cursor jump when I type letter "y"

Sat Jul 9 22:10:40 UTC 2011
Ljubomir Ljubojevic <office at plnet.rs>

Guys. I have this problem for a long time.

In large number of times when I type letter "y", like in "you" my typing 
cursor jumps 2-3 rows up or 1-2 words to the left.

I am unable to understand why. Could it be something with lap-top 
keyboard? Typing rate?

CentOS 5.5 Gnome, I mostly use Firefox and Thunderbird.

Ljubomir