Conditional validation tutorial

Conditional validation tutorial

Hi there.  I am looking for a tutorial on conditional validation.  I have 3 sets of radio button/Textarea in a section and on form submission, I need to loop through them, and for any radio buttons returning 'True', the corresponding textarea needs to contain text.  If possible, I would like just one function or rule to do all three areas.

Then I have 4 other sections with a radio button pair, and a table.  for these, if the radio button is true, there needs to be at least one row in the corresponding table.

So, any links to tutorials, samples, etc would be great.  I am new to jquery.