Imac suddenly dropping wifi connection

Hi, my imac is connected to the wifi network and has worked fine for months.  Now when I'm surfing the web it will be working and then hangs and won't load new pages till it times out.
But it's connected to the wifi network as I can see the wifi icon showing this.  Also, I'm using my laptop (windows) next to it and it's connected and working fine (writing this email on it).
OS:   10.8.3    Not updated recently, and it was working fine
Imac:  3.1 ghz with 12 gig ram
Turning the wifi off and back on fixes it for a few minutes or hours.  Any ideas?

Gary,
I have been having this problem with just one of our iMacs in our house.  I went through Apple support and navigated through all the twists and turns they suggested to try to get the problem solved.  NOTHING WORKED.  THEY DON"T KNOW HOW TO FIX THIS PROBLEM.  BUT I DO!  Unfortunately it involves buying a $30 wireless ethernet adapter (I got an IOGEAR, and I have no connection to their company.  Probably any wireless ethernet adapter will work).  I turned off the internal airport wireless device and through the network settings in the system preferences connected to my CISCO LYNKSYS ROUTER (which has been bashed left and right in the forums here).  THE PROBLEM IS SOLVED!!!!!   NO RESTARTING!!!  NO DROPPED CONNECTIONS!!!!
So the problem isn't with the router, its with the airport wireless adapter in the iMac.  It stinks
to have to spend more money after you lay out so much for an apple product, but it sure beats restarting the computer over and over every day.
Hope this helps my friends out there.  I can now allow my hair to repopulate my head since I've been pulling it out over this issue for months.

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