Keep the cursor in the textarea and add each content per click
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My js: http://jsfiddle.net/creepyzero/4jQ4x/

How do I keep the cursor in the textarea when I click test/test 2 ?

How do I add a and b each time I click test/test 2 ? a and b must be added in the same onclick.

Example:

- I click test, what the textarea has is 1
- Then I click test 2, what the textarea has is 13
- Then I click test, what the textarea has is 132
Thank for your helps :) 

