setting the kernel default

[atomi]

I have two kernels installed (checked by using rpm -q kernel) :
kernel-2.6.17-1.2174_FC5
kernel-2.6.17-1.2187_FC5

Fedora is running on a SC1425 dual xeon 1u server and today I had a kernel
panic.
The server was rebooted to use the old kernel kernel-2.6.17-1.2174_FC5 and
it's still running.

Do I have to do anything so that the server from now on always reboots using
the old kernel-2.6.17-1.2174_FC5 ?
How do I verify what kernel is in use now ?
Is it possible to remove and prevent kernel-2.6.17-1.2187_FC5 or newer
kernels from automatically installing during a yum update?
Also, How would I go about troubleshooting the panic ?

Any response is appreciated.

atomi.
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