selecting startup operating system

Dear Friends,

I had two operating systems windows 2000 and windows 98 running on my PC.
Recently my windows 2000 system crashed. Earlier , while start up windows
2000 was my default start up system. I had given option of 5 seconds to
switch over between the operating systems.
Now I have to remain alert while start up. How can I change the default
start up to windows 98.
In windows 2000 it was easy. In this under system properties I have to
select ‘advanced ‘ tab then press ‘Startup and Recovery’ button. A dialog box
appeared in which I had to select default operating system.