[Yum] YUM update GPG key issue

[mcclnx mcc]

I tried to run "yum update" on my CENT-OS 3.4 and got
GPG key error.  CAn anyone tell me how to fix it?


Is this ok [y/N]: y
Downloading Packages
Getting php-odbc-4.3.2-26.ent.i386.rpm
php-odbc-4.3.2-26.ent.i38 100%
|=========================|  36 kB    00:00     
warning: rpmts_HdrFromFdno: V3 DSA signature: NOKEY,
key ID 025e513b
Error: Could not find the GPG Key necessary to
validate pkg
/var/cache/yum/update/packages/php-odbc-4.3.2-26.ent.i386.rpm
Error: You may want to run yum clean or remove the
file: 

/var/cache/yum/update/packages/php-odbc-4.3.2-26.ent.i386.rpm
Error: You may also check that you have the correct
GPG keys installed

___________________________________________________  最新版 Yahoo!奇摩即時通訊 7.0，免費網路電話任你打！  http://messenger.yahoo.com.tw/