Well, you can't do it for all question types. For example, if you apply it to a mandatory array, the respondent will never be allowed to proceed.
To have all List (radio) questions automatically click the "Next" button, add this to the end of template.js:
Code:
$(document).ready(function() {
$('.list-radio input[type="radio"]').click(function(event) {
$('#movenextbtn, #movesubmitbtn').click();
});
});
To have a specific List (radio) question automatically click the "Next" button, add this to the question source:
Code:
<script type="text/javascript" charset="utf-8">
$(document).ready(function() {
$('#question{QID} input[type="radio"]').click(function(event) {
$('#movenextbtn, #movesubmitbtn').click();
});
});
</script>
.