Lpc2000

I am working on a scheme to update the code in an LPC2106 via
Ethernet.  The application is done and working, I have connection to
the host via ethernet.  I have been asked to allow code updates via
the ethernet.  I have IAP calls functioning.  Our code will remain
under 64KB so there will be room for new code in on-chip flash.  Right
now my plan is to:

Build the loader into the existing code.  This will, when prompted by
the host, prepare and erase upper sectors, accept a chunk (512B or
8KB?) of the new code from the host, and store it in RAM.

Each chunk of new code will be programmed to the blank sectors after a
CRC check.

When done, a global CRC will be performed.

Questions:

How to transfer execution to the new code segment?  

What about the vector table?

Other ignorance on my part?

Thanks

Rich