Someone did that to mine a couple of months ago, but the mirror snapped back into place. Has the mount broken? The mirrors are springloaded and designed to give when hit. Are you sure it doesn't just need pulling back towards the rear of the car?
Would help if you had a photo.
<b><u>'05 <font color="#FF0000">Emocion Red </font>1.2 12v 3dr Reference</u></b>