Capitalisation javascript not woking

I am using the following code to try to capitalise text in input boxes.

str = str.replace(/[^-'\s]+/g, function(word) {
  return word.replace(/^./, function(first) {
    return first.toUpperCase();
  });
});

function cnvrt2Upper(str) {
        return str.toLowerCase().replace(/\b[a-z]/g, cnvrt);
        function cnvrt() {
            return arguments[0].toUpperCase();
        }
    }

In Firefox the first function reports that .replace is not a valid function, and when I run the second function it says .toLowerCase is not a function.

What am I doing wrong?
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jdthedjAsked:
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leakim971PluritechnicianCommented:
the following work for me : http://jsfiddle.net/u93mhq6p/
function cnvrt2Upper(str) {
    return str.charAt(0).toUpperCase() + str.toLowerCase().substr(1);
}

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jdthedjAuthor Commented:
Thanks leakim971, but I need to capitalise each word id there's more than one word in a text box
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leakim971PluritechnicianCommented:
updated : http://jsfiddle.net/u93mhq6p/1/
function cnvrt2Upper(str) {
    var cap = function(s) {
        return s.charAt(0).toUpperCase() + s.toLowerCase().substr(1);
    };
    return str.replace(/([^-'\s]+)/g, cap);
}

alert( cnvrt2Upper("hello mister how are you") );

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jdthedjAuthor Commented:
I still get the following error in Firefox


TypeError: str.replace is not a function
      

...unction(s) { return s.charAt(0).toUpperCase() + s.toLowerCase().substr(1); }; re..
0
jdthedjAuthor Commented:
I have done some more experimenting - your example works with the alert, but not if on the form I have this

<input type=text size=40 onBlur="cnvrt2Upper(this)">
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jdthedjAuthor Commented:
Finally got it working - thanks leakim971!
0
leakim971PluritechnicianCommented:
<input type=text size=40 onBlur="cnvrt2Upper(this.value)">

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