JQuery ::: Focus On Tabindex Instead Of Input?

The function below will automatically move to the next input field in the event that a user hits the enter key. I'm trying to modify it so that it moves to the next input field with a tabindex set. So, in the example below, it'll move to the next input field chronologically, instead of how they're ordered on the page itself:

<input type="text" name="a" tabindex="1" />
<input type="text" name="b" tabindex="3" />
<input type="text" name="c" tabindex="2" />

how I can do it?

Code:

$('input').live("keypress", function(e) {
/* ENTER PRESSED*/
if (e.keyCode == 13) {
/* FOCUS ELEMENT */

[Code]....