Help me please!

HI! everybody
I am a new member I have learned Flash for a few months
can you help me to make a swf, when I move the mouse over the scene,
animation will play at the point and it have dynamic text which display the mouse’s co-ordinate
And in the tutorial about use microphone for input I don’t understand this line
“circle._xscale = circle._yscale = m…”
is it to draw a circle but when I want to draw a circle I have to know its co-ordinate and radius???
Oh!sorry , I can’t speak English well,Do you understand me??