<input rel='popover' placeholder='This field is optional' data-trigger='hover' data-delay='1000'
data-original-title='OTP hardware authentication'
data-content=\"With this field you can login using a hardware OTP device called 'yubikey'.<br>
If you login the first time with a CDRTool account and the username, password and OTP key filled in, the key identifier is stored into you account.<br>
For info and purchase of this key see <a href='http://www.yubico.com' target='_blank'>http://www.yubico.com</a>