Yet another "my blazer won't start thread"

I looked at the others and couldnt really find any common ground except for the fact that they don't start. Here's the problem.

I walk out of school today to find out my car doesn't start. '96 Blazer s-10. I turn the key and i get some rapid clicking noise, no sound of the engine turning, and it continues as long as i hold the key on start. I've been told it might not be the starter because if that goes, than it would only click once... not sure if thats entirely true. I've also been told it could possibly be the battery or the alternator.

For what it's worth i can still turn the key to on and have the electronics work normall, the day lights still work. But no starting.

Thankyou

Nevermind, figured it out. Bad Battery.