Hi RamKumar,
I would suggest you to leave the Idea of designing a programmer the better way to do the programming is using ISP [ In system programming ]. ISP gives you an advantage that you don't need to remove the chips from your board for programming. The other advantage is you don't need a programmer board.
For using ISP you will need to use AT89Sxx chips such as AT89S51,AT89S52, AT89S8252 etc. If you are planning to use Philips IC's you can use P89C51Rx2 chips. For In-System Programming of ATMEL IC's you you can either...
1. Buy the ISP adapter.
2. Make one your self.
If you want to make it yourself. here is the link to one such adapter..
http://www.kmitl.ac.th/~kswichit...gm3v0.html
If you use philips IC's you don't need any kind of adapter all you need is a staright serial cable.
9 Pin female --->9 Pin male. You can use flashmagic software for programming philips chips. You can download flashmagic at http://www.esacademy.com/software/flashmagic.

Still If you are not convinced to use ISP and want to use the traditional parallel programming with AT89C5x series IC's.
than here are the links for parrallel programmers.
http://chaokhun.kmitl.ac.th/~kswichit...asyp52.htm
http://www.willem.org/ZIP/Doc%20V31s.zip
Both the boards are single sided and you can build them easily the second one i.e. willem can program not only AT89C5x but also a lot of other IC's such as PIC, serial ROM's, Parallel ROM, FLASH, AVR etc.
Regards,
Prahlad Purohit