It depends if that Windows 98 SE is a full version or an upgrade. If it's full, then you can upgrade to either version of Windows XP (Home or Pro). So, get the upgrade version.
When installing on a clean hard drive, when you start the Windows XP install, it'll ask for a previous version. Just use that Win98 CD for your ticket to a WinXP install.
<A HREF="http://www.microsoft.com/windowsxp/pro/howtobuy/upgrading/matrix.asp" target="_new">"Upgrading from Previous versions of Windows" - Microsoft</A>
<font color=red><A HREF="http://www.btvillarin.com" target="_new">btvillarin.com</A> - My Windows XP-based Website</font color=red>