Place your image in a text-display question,
set up your survey to use JavaScript
and place the following script in the source of the question:
<script type="text/javascript" charset="utf-8">
$(document).ready(function() {
// Hide the "Next" button
$('#movenextbtn, #movesubmitbtn').hide();
// Delay in milliseconds
var timeSpan = 5000;
// Timer to click "Next"
setTimeout(function() {
$('#movenextbtn, #movesubmitbtn').trigger('click');
}, timeSpan);
});
</script>