Go to http://www.bootdisk.com/bootdisk.htm and create a boot floppy.  Use it
to start the computer, type "fdisk" and press "Enter".  

Ben

That info is contained in these instructions on installing W98:
http://home.satx.rr.com/badour/html/w98_restore.html

You could also use a partitioning program--here's the one I use:

BootIt Next Generation is available from:  http://www.terabyteunlimited.com/
and it does partitioning, makes a compressed image, does many other
partitioning chores and is a boot manager.  It is not quite as easy to use
as Partition Magic but it is half the cost and has more features.  Unlike
the crippled PMagic demo, BING is a *full function* demo you can try for
FREE for 30 days.  The web site has a lot of support articles.