Is there any body help me, high CPU load!!!

Friends, I have a problem and I can't find where is the problem because I don't know what can I do...

My problem is high CPU load.
I have a dedicated server (p4 3.0HT, 512MB ram, IDE disk) and only 1 web site on it.

This web site has almost 100 users online at same time(3 minutes interval).

AND if users increase to 130-140 cpu load became 2/2 (HT makes 2 cpus).

I have very important questions for me

1. Is this load normal?
2. I am suspicious about mysql load can this info tells me quilty is MYSQL

User Domain %CPU %MEM Mysql Processes
mysql 6.17 301.11 0.0

I want to know the reason of this high CPU load. I worked on the PHP programming but verything is ok, indexes etc...

What can I do, please help me

Thanks to every one..

 

 

 

 

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