Well perhaps you should use the search button more often, there are several post about this problem...
But well, there is one possibility to pass this problem (although it is not really satisfying):
Get a PSOne emulator for PC (for example ePSXe) convert the savegame from the psp into the format the emulator can read, start the game on the emulator and perform the disc swap, save your game, convert it back to the format the psp can read and you're done...
(I'm not too sure with the converting of the savegame, perhaps ePSXe can read the savegame without converting...don't know)
Or you can just download a savegame...
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