There are two ways to do that:
1. Install on the W2K server additional drivers (Star>Printers, select the printer, rightclick it > Properties>Sharing and check Additional Drivers) for W98 system. Once you did that, you go to printer>sharing... and you create a share name for the printer and then you check "share this printer". Then, from the w98 computers, browse the network towards the W2k computer and dubleclick on the printer share name, and follow the instructions to install the printer on the W98 clients.
2. Create a share name and share the printer in W2k. Use the CD provided for installing the printer on W98 computers, and when asked, choose the "Network printer..." option, and browse the network towards the W2K computer and click on the printer's share name. Finish the installation of the printer.
The difference between the two obtions is that if you use 1., you'll never need the printer CD for the other computers. And if any new w98 client will appear, he'll just has to doubleclick on the printer's share name.
Good luck!