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Almost all of my javascript code has been moved over to its new home at The Javascript Toolbox. Please go there to find the latest scripts, information, etc. These pages will remain here for a while for historical purposes in case anyone needs a production copy of old code.
Tabnext
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The original source file (2k)
Right-click and "Save As" to download this file: tabnext.js or copy and paste the text from below.

// ===================================================================
// Author: Matt Kruse <matt@mattkruse.com>
// WWW: http://www.mattkruse.com/
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however it is
// appreciated by the author if at least my web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download. 
// If you wish to share this code with others, please just point them
// to the URL instead.
// Please DO NOT link directly to my .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================

//-------------------------------------------------------------------
// getElementIndex(input_object)
//   Pass an input object, returns index in form.elements[] for the object
//   Returns -1 if error
//-------------------------------------------------------------------
function getElementIndex(obj) {
	var theform = obj.form;
	for (var i=0; i<theform.elements.length; i++) {
		if (obj.name == theform.elements[i].name) {
			return i;
			}
		}
	return -1;
	}

// -------------------------------------------------------------------
// tabNext(input_object)
//   Pass an form input object. Will focus() the next field in the form
//   after the passed element.
//   a) Will not focus to hidden or disabled fields
//   b) If end of form is reached, it will loop to beginning
//   c) If it loops through and reaches the original field again without
//      finding a valid field to focus, it stops
// -------------------------------------------------------------------
function tabNext(obj) {
	if (navigator.platform.toUpperCase().indexOf("SUNOS") != -1) {
		obj.blur(); return; // Sun's onFocus() is messed up
		}
	var theform = obj.form;
	var i = getElementIndex(obj);
	var j=i+1;
	if (j >= theform.elements.length) { j=0; }
	if (i == -1) { return; }
	while (j != i) {
		if ((theform.elements[j].type!="hidden") && 
		    (theform.elements[j].name != theform.elements[i].name) && 
			(!theform.elements[j].disabled)) {
			theform.elements[j].focus();
			break;
			}
		j++;
		if (j >= theform.elements.length) { j=0; }
		}
	}