//data
$msg = “NAME: ” .$_POST['name'] .”\n”;
$msg .= “EMAIL: ” .$_POST['email'] .”\n”;
$msg .= “COMMENTS: ” .$_POST['comments'] .”\n”;
$msg .= “RADIO: ” .$_POST['radio'] .”\n”;

<div>
						<input  name="radio"  id="radio1" type="radio"  title="This is radio 1" value="value1" onfocus="defaultInput(this,'This is radio 1')" onblur="clearInput(this,'This is radio 1')" checked />This is radio 1
						<input  name="radio"  id="radio2" type="radio"  title="This is radio 2" value="value2" onfocus="defaultInput(this,'This is radio 2')" onblur="clearInput(this,'This is radio 2')" />This is radio 2
						<input  name="radio"  id="radio3" type="radio"  title="This is radio 3" value="value3" onfocus="defaultInput(this,'This is radio 3')" onblur="clearInput(this,'This is radio 3')" />This is radio 3
					</div>

// radio
var radio = $(‘input[name="radio"]:checked’).val();


// Create the data string
		var dataString = 'name='+ name
						+ '&email=' + email        
						+ '&comments=' + comments
						+ '&radio=' + radio
						+ '&to=' + to
						+ '&from=' + from
						+ '&subject=' + subject;