That's kind of similar to what I did. What finally worked was setting the next button to send a value of 'add' and the previous to send a value of 'subtract'. Then, I went into the class file for the page, and checked to see what the value of post was for that variable. Then, based on that value, I manipulated my accumulator in the class file, as opposed to the main page file, and it works beautifully now...
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