yum problem ( name resolution error )

[netsecure]

Hey i have a fedora core 8. So i thought of installing mplayer on it
but when i do
yum install mplayer i get these error. can anyone tell me whats wrong?

[root@Fed0raL1nux ~]# yum install mplayer
development 100% |=========================| 2.4 kB 00:00
updates-debuginfo 100% |=========================| 1.9 kB 00:00
ftp://ftp.rhd.ru/pub/fedora/linux/re...ta/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>
Trying other mirror.
fedora 100% |=========================| 2.1 kB 00:00
development-debuginfo 100% |=========================| 1.9 kB 00:00
updates-source 100% |=========================| 2.1 kB 00:00
updates-testing-debuginfo 100% |=========================| 1.9 kB 00:00
updates-testing 100% |=========================| 2.3 kB 00:00
updates 100% |=========================| 2.3 kB 00:00
ftp://mirror.wbut.ac.in/pub/fedora/l...ta/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>
Trying other mirror.
ftp://ftp.sfc.wide.ad.jp/pub/Linux/F...ta/repomd.xml: [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>
Trying other mirror.
updates-testing-source 100% |=========================| 2.1 kB 00:00
development-source 100% |=========================| 1.9 kB 00:00
fedora-source 100% |=========================| 2.1 kB 00:00
fedora-debuginfo 100% |=========================| 2.1 kB 00:00
Setting up Install Process
Parsing package install arguments
No package mplayer available.
Nothing to do
[root@Fed0raL1nux ~]#


why does it say no package mplayer available? Btw when i do yum for some other package it does work.. and why is the problem with temprary failure in name resolution?