Help installing 10.4.7 on emac runing 10.2.8 ASAP!

the grey discs are not for your eMac model ,
as the 700mhz only shipped with 10.1 ,
so did the 800mhz model ,
the 1ghz model shipped with 10.2,
and the 1.25 ghz model with 10.3 ,
only the 1.42 ghz model shipped with 10.4
and all discs are grey
but you cant use the grey disc of a 1.42 ghz model to install on a 700mhz model ,as these grey discs are totally model specific install discs and cant be used on other macs problem solved
what you need is simple a retail disc of 10.4 tiger