Thanks for the replies guys, I assumed i was going to get abuse because i answered my own question. Its nice to be in such a nice forum. The links are great sputnik, cheers. Oldvan i agree, it would be much better if the tone emited was a different frequency each time. Looking at one of the links one uses a pic, its much smaller than the one featured at make and also has more versatility i reckon it would be quite easy to add a random pitch as well. I have a pic lying about so i may have a little play around and see what results i can get if i have time.
Thats a good story oldvan - i plan on doing this to one of my teachers, we shall see what happens im generally considered a fairly well-behaved student!
One more thing, regarding thank yous, not allowed to say thank you at all in posts? or can we say thank you accompanied by a message as well?
I think it would be best just to use the thank you button if your post is just going to be a thank you. However, your post above seems acceptable since you commented on other things as well as said thank you.