boot directly from any iso file by first booting from dvd

i have a one dvd.it has iso files of windows xp , windows 2000 , windows 98,also linux mandriva cds isos,knoppix live cd iso..

now i want that when i boot from my dvd then i should have a option to further select that from which iso i want to boot.
means i want to boot from individual iso by putting them just in one dvd..

i want to do this as this saves my cds .
i can boot from dvd but how to boot from iso.

also otherwise is there anymethod to merge the boot procedures of every iso image in dvd to dvd's bootable menu soo that there is a common boot menu for each iso..

anybody can tell me how can i do this..

give me any tutorial etc..