How to upgrade the version php 4.4 to 5.x

[prakashs]

I have tried to upgrade the php version from 4.4 to 5.x in the plesk panel.. I have my parallel server details also. I installed the php 5 packages.. I got the following url.. I have searched as well.. I couldn't able to figure it out how to upgrade the server..

http://forum.parallels.com/pda/index.php/t-85461.html
http://forum.parallels.com/showthread.php?t=85461&highlight=upgrading+php+version
http://www.atomicorp.com/wiki/index.php/PHP

how can we install third party tool like 'ART' and how can i run 'yum'? can you please any one help me?