On SLES (and I assume OpenSUSE) there is an install= kernel parameter where you can tell the installer where to grab the install media. It supports http and nfs and probably more.

kernel sles.kernel
append install=http://server/SLES (other options ommited)

When the installer starts it will not prompt you for the CDs any more. As a side note, there are tutorials out there on how to convert all the install CDs to a single directory tree so you can share it out.