hello, i am new to sketchup, and its a great program, i have almost finished modelling my house after three weeks of modeling and learning.

I have never used layers before in sketchup, and i tried it today, but whenever i click over a layer name, a strange beeping sound comes from my compuuter even when the volume is off.
what is it?

well, thank you very much!

i am using sketchup 7 now.