Dynamic text change color?

[SIZE=2]Hi all,
First of all i would like to thank all of you, I’ve been around allready for a while. looking ,reading but most of all learning allot from all of you.
and now what i would like to learn.
I saw the menu over at designcharts and was wondering how that was made.
I expect it gets its content dynamicly, xml or php that i can understand, but how would you make that rollover effect with dynamic text?
i never thoughed it was possible to mask dynamic text.
If there is somebody out there that knows how to build it please share it,
thanx in advance!