Looking for a simple way to convert a string to title case

Question

New to LiveCycle and Javascript.  Looking for a simple way to convert a string to title case, except acronyms.  Currently using the the following, it converts acronyms to lower case:
var str  =  this.rawValue;
var upCase = str.split(" ");
for(i=0; i < upCase.length; i++) {
upCase[i] = upCase[i].substr(0,1).toUpperCase() + upCase[i].substr(1).toLowerCase();
this.rawValue = upCase.join(' ');

Answer 1

Thanks for the reply.
Found the following script in a forum, which works fine as a "custom validation script" in the.pdf version of my form.  However, it will not work in LiveCycle?  The problem seems to be with
"return str.replace(/[A-Za-z0-9\u00C0-\u00FF]+[^\s-]*/g"
function toTitleCase(str) {
var smallWords = /^(a|an|and|as|at|but|by|en|for|if|in|nor|of|on|or|per|the|to|vs?\.?|via)$/i;
    return str.replace(/[A-Za-z0-9\u00C0-\u00FF]+[^\s-]*/g, function(match, index, title){
if (index > 0 && index + match.length !== title.length &&
  match.search(smallWords) > -1 && title.charAt(index - 2) !== ":" &&
(title.charAt(index + match.length) !== '-' || title.charAt(index - 1) === '-') &&
title.charAt(index - 1).search(/[^\s-]/) < 0) {
return match.toLowerCase();
if (match.substr(1).search(/[A-Z]|\../) > -1) {
  return match;
  return match.charAt(0).toUpperCase() + match.substr(1);
event.value = toTitleCase(event.value);