i set the router to "lifetime"
i then turned of all the machines,wireless router and modem.
then turned on the modem,wireless router,this then cleared all machine IP's.
then i turned on all the machines in order of which i wanted first on the list IE,#1.#2 and so on.
then rebooted all the machines.
yippee,they all have the same IP's as before i rebooted.

thanks Rev.
@ rik,cheers,
if for any reason this fails in the future,i'll be sure to have a go with your suggestion.

thanks guys.