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HTML

The js file below is located in 

typo3conf/ext/powermail/templates/tmpl_frontend.js

Have a look at the commands in lines
<ul>
    <li>39-41</li>
    <li>35-36</li>
    <li>26</li>
    <li>6-8</li>
</ul>    

Useful documentation: Look into lines 20 and 21

JavaScript

(function($) {
	       // ... some code 
    
    
		  $('.tx_powermail_pi1_form input:radio').click(function() {
            // after form has validated, we use the validation for 
            // all radio buttons in our radio button group
            // we use here blur as the inputEvent is "blur" in line 23
			$(this).parent().parent().find('input:radio').blur();
			
		 });
		
        // ... some code

		
		

		if (!###VALIDATOR_DISABLE###) {
			powermail_validator = $('.tx_powermail_pi1_form').validator({
            // config variables:
            // see http://jquerytools.org/documentation/validator/index.html#api
            
                position: 'top right',
				offset: [-5, -20],
				message: '<div><em/></div>',
				inputEvent: 'blur',
				grouped: true,
				 singleError: false,
                // We check the validity of the fields if the form is submitted
				formEvent : 'submit',
				onBeforeValidate: function(e, els) {
					clearPlaceholderValue(e, els);
				},
				onBeforeFail: function(e, els, matcher) {
					setPlaceholderValue(e, els, matcher);
				},
				onFail: function(e, els) {
                    // We do not want scrolling to the field where validation failed
					//$('html,body').animate({ "scrollTop": $(els[0].input).offset().top - 50}, 1000);
				}
			});
            // We do not want the built-in check (supposed to be built by powermail extension authors) for     //radio buttons
			$('.tx_powermail_pi1_form input[type=radio]').unbind("change");
			
		}

        // some code ...
	});
})(jQuery);