how to calculate the mouse speed?

hi, everyone
 now, i can use actionscript to get mouse x and y position, and i try alot of methods, still can't get the mouse speed. can anyone tell me how to do that?

ps: i want to get mouse speed. so that i can know users move their mouse fast or slow.
justice_ongAsked:
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OBCTCommented:
First we'll need to know a few things before we can take this any further...
How do you want the mouse speed to be measured?
How do you plan on storing the information?

The only way I could think of doing this is by running a trace on the mouse co-ordinats and by running a timer to calculate the time it takes for the user to move from pixel to pixel, then calculating the average time and have that stored in an online database...

Cheers

-OBCT
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justice_ongAuthor Commented:
ya..i have used timer. but the problem is i always get the result zero..
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negatyveCommented:
try this on a movieclip:

onClipEvent(enterFrame){
      trace(Math.round(Math.abs(_root._xmouse - this.oldx)));
      trace(Math.round(Math.abs(_root._ymouse - this.oldy)));
      this.oldx = _root._xmouse;
      this.oldy = _root._ymouse;
}
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