// ===================================================================
// Author: Matt Kruse <mkruse@netexpress.net>
// 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. Instead,
// please just point to my URL to ensure the most up-to-date versions
// of the files. Thanks.
// ===================================================================

//-------------------------------------------------------------------
// 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; }
		}
	}