Problem with "Enter Key"

I would like to add the functionality to my web app that when in a textbox you press the enter key it takes you to another textbox in the same page, how could I do this. To better explain my problem i have a row in a table that has 1 dropdownlist, 2 textboxes and a button for selecting and inserting data so what I want to do is that when the are in the first textbox and want to fill the second one they just press enter and they'll be in the next textbox, the second one to fill it out, also when in the second textbox when they press enter they automatically press the button beside it.

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