单选按钮和一个输入字段(Radio Button and an Input field)

 我举了个例子，这是你想要的吗？ http://www.jsfiddle.net/T7gE7/ 
 
var temp = '';
function disableTxt() {
    var field = document.getElementById("other");
    if(field.value != '') {
        temp = field.value;
    }
    field.style.display = "none";
    field.value = '';
}
function enableTxt() {
    document.getElementById("other").style.display = "inline";
    document.getElementById("other").value = temp;
}

I made you an example, is this what you wanted? http://www.jsfiddle.net/T7gE7/
 
var temp = '';
function disableTxt() {
    var field = document.getElementById("other");
    if(field.value != '') {
        temp = field.value;
    }
    field.style.display = "none";
    field.value = '';
}
function enableTxt() {
    document.getElementById("other").style.display = "inline";
    document.getElementById("other").value = temp;
}