Please see the form HTML code below

<form method="post" action="register">      
    <div class="email">
        Email   <input type="text" tabindex="1" id="email" value="" name="email">                   </div>
    </div>
    <div class="agreement">
        <div tabindex="2" class="terms_radio">
            <div onclick="changeTerm(this);" class="radio" id="terms_radio_wrapper" style="background-position: left 0pt;">
                <input type="radio" id="terms" value="1" name="terms"><label for="terms">I have read and understood the ZapAV</label>
            </div>
        </div> 
    </div>
    <div class="form_submit">
        <input type="button" tabindex="3" value="Cancel" name="cancel">
        <input type="submit" tabindex="4" value="Submit" name="submit">         
    </div>
</form>

Here I syled teh agreement check box insuch a way that radio input is completly hidden and background image is applied to the wrapper div, and onclick of the wrapper div will toggle the backgroud image as well as the checked status of teh radio input.

I need to set the tabindex index on the 'terms_radio' DIV, simply tabindex="2" attribute on div is not working,

Is it possible to bring the dotted border on the label for the radio input up on pressing the TAB when the cursor is at email input field?