Capitalizing the first letter of each word

[Jim Weinberg]

Is there a way to take a text entry from a form and make sure/change the first letter of each word is capitalized and the rest are lowercase?

[Twey]

String.prototype.toTitleCase = function() {
  var words = this.toLowerCase().split(" ");
  for(var i=0;i<words.length;i++)
    words[i] = words[i].charAt(0).toUpperCase() + words[i].substring(1);
  return words.join(" ");
}
var sentence = "tHE QuiCk bRoWN Fox jUMpS oVEr THE LaZY dog";
window.alert(sentence.toTitleCase());