single point of failure in a highly available cluster of web servers.

Hello Wackamole users,

I am trying to eliminate a single point of failure outlined below (I am 
new to Wackamole so please forgive me if I am missing the basics).

My concern is Wackamole seems to be aware of computer servers crashing 
but not the web server crashing.  Is there anyway to have Wackamole take 
over the IP of a server if httpd crashes, not the machine itself.

For example I have two backhanded servers with Wackamole to service a 
virtual IP.  If machine A has the IP and it crashes, the Wackamole will 
have Machine B take over.   However, if httpd on Machine A crashes while 
Machine A is still running fine, my web farm is now dead even though 
Machine B is functioning fine.

Is there any way to eliminate this single point of failure?

If anyone knows how to configure this, or, work around this please let 
me know.

Thanks,
-Rama