[danik.js]

<input type="text" id="bdF13" class="manFlOth1" size="35" style="width:100%;" name="other1" maxlength="100">
<label><input type="radio" name="state" value="done">Выполнено</label>
<label><input type="radio" name="state" value="inprogress">В разработке</label>
<script>
(function(){
    var input = document.getElementById('bdF13'),
        radios = document.getElementsByName('state');

    var onchange = function() {
        input.value = this.nextSibling.nodeValue;
    }
    for (var i = 0; i < radios.length; i++) {
        radios[i].onchange = onchange;
    }
})()
</script>