Uppercase first letter of variable

Question

I have searched over the web can can\'t find anything to help me. I want to make the first letter of each word upper case within a variable.

So far i have tried:

Answer 1

 var str = "HELLO WORLD HELLO WORLD HELLO WORLD HELLO WORLD";
         str = str.replace(
                        /([A-Z])([A-Z]+)/g,
        				function (a, w1, w2) {
                            return w1 + w2.toLowerCase();
                        });
alert(str);