How can I prevent my iMac from disconnecting from the internet?

Ever since I upgraded to Mountain Lion, my iMac keeps disconnecting from the internet when I'm away from the computer for a bit. It's not a huge deal but it is pretty annoying to have to wait for the modem to reconnect every time. Why is it doing this, and is there any way to prevent it?
I'm on a 2007 iMac with the most recent versions of Mountain Lion and Safari. My internet connection is via DSL.

HI,
Each version of the OS can reconnect at different rates depending what was running before the computer went to sleep.
If I let my G4/1Ghz Tower go to Sleep it takes a long time to respond in general and by the time I can use it the Network is Connected.
However my 2011 iMac (i5) is fairly zippy but apps can be "ready" before the Network is confirmed.
I notice particularly if I have Messages and Browser open.
9:28 PM Saturday; August 24, 2013
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.4)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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