Disable or Enable Text Fields by clicking a CheckBox – JAVASCRIPT

function UsernamePasswordBox() {
var value = document.getElementById(‘login_as_guest’).checked;
if (value == true){
document.getElementById(‘login’).disabled=true;
document.getElementById(‘pass’).disabled=true;
}
else{
document.getElementById(‘login’).disabled=false;
document.getElementById(‘pass’).disabled=false;
}
}

In Body:

Login:

<input class=”text” name=”login” id=”login” value=”" type=”text” title=”">

Password:

<input class=”password” name=”pass” id=”pass” value=”" type=”password” title=”">

Login as a guest: <input name=”login_as_guest” id=”login_as_guest” type=”checkbox” title=”" onclick=”UsernamePasswordBox()”>