locating rpms

hi, for example, when I try to install mod_php4-core.rpm, rpm tells that these libraries? are needed libexpat.so.1 libmcrypt.so.4 libpdf.so.0 libpq.so.2.1 libsablot.so.0 libt1.so.1 is there an easy way to locate which rpm packages covering those libraries? And secondly, I would like to learn whether there is a mechanism to locate the suse rpms? I always try to find them in the ftp server but it is time-consuming, you know. thanks, baris