Download an appropriate boot disk from bootdisk.com or other source, install Winimage, build a bootdisk image file, use your cd burning software to make a bootable CD using "floppy emulation", and you are good to go.
You can put other software on the rest of the CD including drivers and a self-extracting Winimage file of your boot disk for writing to actual floppies in future. Windows 2000 and 98, for example, fit nicely on one CD.