Mac OS X 10.4.10 upgrade to 10.5

Yes you can.

Boot from your OS X install disc, follow instructions, hit option before install, and select upgrade ( it should be selected by default)
 
To be more specific: Boot from the Mac OS X 10.5 install disc, and then upgrade...
(The black discs = retail set, not CPU specific 10.5 discs)
 
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