I have just ordered download via email to upgrade from 10.6.8 to Lion.  Will I need my original mac installation disc?

I don't have it anymore unfortunately after it was damaged in storage, so I'm concerned.  It's an iMac I bought in mid 2007.
If someone could set my mind at ease about this I would be very grateful.
Many thanks
Dave
Model Name: iMac
  Model Identifier: iMac7,1
  Processor Name: Intel Core 2 Duo
  Processor Speed: 2.4 GHz
  Number Of Processors: 1
  Total Number Of Cores: 2
  L2 Cache: 4 MB
  Memory: 2 GB

Thanks Niel.  That's a massive weight off!
Has an internal drive fail been known to happen during an upgrade or do you just mean generally?  Sorry if that seems a really stupid question, but I am stupid when it comes to this sort of thing!

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