<div class="radio">
<input type="radio" name="option1" id="radio3" value="100" />
<label for="radio3" id="ohund">100</label>
<input type="radio" name="option1" id="radio4" value="500" />
<label for="radio4" id="fhund">500</label>
</div>
<div class="text_sub">
<input type="text" id="summ" placeholder="Другая сумма"/>
<input type="button" value="Отправить" id="butt" />
</div>