Check Box to autofill other fields

[jbrea66]

Hi have a form that has 2 different sections. First section is Business Address the 2nd is the Mailing address. I would like to get a script that I can add to my form that will add a Check Box with the following words: Click here if same as Business Address. When the client click the Check Box it will then auto fill the Mailing address with the Business Address.

[TheAliveWinner]

<fieldset>
    <legend>Form</legend>
    <form name="_form">
        <label> Business Address: </label> <br/>
            <textarea name="_addr_busi"></textarea> <br/>
        <label> Mailing Address: </label> <br/>
            <textarea name="_addr_mail"></textarea>
        <label> <input type="checkbox" name="_checkbox" onclick="copy()" /> Click here if same as Business Address!</label>
    </form>
</fieldset>

<script>
    var copy = function () {
        if(document.forms['_form'].elements['_checkbox'].checked == true) {
            document.forms['_form'].elements['_addr_mail'].value = document.forms['_form'].elements['_addr_busi'].value;
        } else {
            document.forms['_form'].elements['_addr_mail'].value = '';
        }
    }
</script>