Need some help about removing www. - onclick

I need a bit help here. I have javascript function for removing white space and http(s)*: from input form.

script type="text/javascript">
        function removeWhitespace() {
        var txtbox = document.getElementById('txtOne');
        txtbox.value = txtbox.value.replace(/\s/g, "");
        txtbox.value = txtbox.value.replace(/^http(s)*:\/\//i, "");
        }
    </script>

Code (markup):

Then inside input tag i have

 <input type="submit" value="" onclick="removeWhitespace()" />

Code (markup):

It works excellent but what i need now is also one extra line to remove also www. so that i can get get clean domainname.


thanks

 

You may use

txtbox.value = txtbox.value.replace(/www\./g, "");​