VirtualBox安装Centos5后怎么安装增强功能

VirtualBox安装Centos5后如何安装增强功能
挂载光驱：
mkdir /mnt/cdrom
mount /dev/cdrom /mnt/cdrom

yum install kernel-devel
yum install gcc
ln -s /usr/src/kernels/2.6.18-..... /usr/src/linux
sh VBoxLinuxAdditions-x86.run

http://blog.home265.com/?p=145