How to insert instrcutions at the beginning and/or at the end of each basic block?

Hi,

I'd like to instrument my java classes and insert certain sequences of
instructions at the beginning and/or at the end of each basic block
(specifically, these instructions are supposed to call a static method of
predefined class).

How this can be done? 

Do I need to use classes from the org.objectweb.asm.tree.analysis for it? I
undrestand how I can obtain frames using something like:
Analyzer a = new Analyzer(new BasicInterpreter());
...
a.analyze(owner, mn);	
Frame[] frames = a.getFrames();

But how do I get from frames to instructuions contained in this basic block,
so that I can insert new ones?

May be there are some existing examples for this kind of instrumentation
already?

Thanks for any help,
 Leo
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