I've put up a schematic Inchworm; on my site of my take on the many fine designs of Microchip ICD2 emulators on the web. It's based mostly on the excellent version by Lothar Stolz.
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I've used the MAX232 as a voltage tripler to get the ~12.5v needed for VPP and added handy busy & power LEDs.
You will need to program the bootloader "bl010101.hex" file located in the ICD2 directory onto a 16F876 (or 877) C:\Program Files\Microchip\MPLAB IDE\ICD2\BL010101.HEX
A simple programmer like the one with PonyProg
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should do the job nicely.enjoy