some jerk hit my drivers side mirror and cracked the mirror

[dna]

The other day I was driving my 03 H2 and noticed a nice crack in my drivers side mirror. I know it was not cracked the other day. Went outside and checked it out and sure enough a small nick is in the chrome housing. Some dump **** probably smacked their mirror on mine in the local mall while my truck was parked.

Anyway, I did a quick search on ebay and was blown away that a replacement unit is $300+. However I found some companies selling just the replacement glass - you simply break away the broken glass off the backing and glue the new mirror to the housing.

My only question is, will this kill my auto dimming feature? I do not know how the dimmer works - is it a specific mirror/glass that does that?

The replacement glass is about $25 versus $300 for a whole new unit. If my dimmer will be gone with the glass replacement, whats you opinion. Would you pay the extra $275 just to have the dimmer work again? I personally like it, but much sure if I $275 like it.

Thanks