jquery - How to set the tab index and cursor at the end of the text -

I opened a popup using the JQuery dialogue, there is a texture and 2 buttons when it opens the textarea in this curser Some text is in the beginning of the text ... so I want at the end of the text..how can I use Jquery or Asp? And when the user clicks on the tab, he should go to the button.

same question:
you will get an original idea;)