Default selected "Yes" for a particular question

<script type="text/javascript" charset="utf-8">
	$(document).ready(function() {
 
		if($('#question333 input.radio:checked').length == 0) {
			document.getElementById('answer82352X12X333Y').checked = 'checked';
		}
 
	});
</script>

$(document).ready(function(){ 
 
	if($('#question333 input.radio:checked').length == 0) {
		document.getElementById('answer82352X12X333Y').checked = 'checked';
	}
 
	// Apply images to radios 
	$('input[type="radio"]').imageTick({ 
		// Image to use as a selected state of the radio
		tick_image_path: "upload/templates/yourTemplateName/radio.gif", 
		// Image to use as a non-selected state 
		no_tick_image_path: "upload/templates/yourTemplateName/no_radio.gif", 
		// Class to apply to all radio images that are dynamically created 
		image_tick_class: "radios"
	}); 
 
	// Apply images to checkboxes 
	$('input[type="checkbox"]').imageTick({ 
		// Image to use as a selected state of the checkbox  
		tick_image_path: "upload/templates/yourTemplateName/check.gif",  
		// Image to use as a non-selected state 
		no_tick_image_path: "upload/templates/yourTemplateName/no_check.gif", 
		// Class to apply to all checkbox images that are dynamically created 
		image_tick_class: "checkboxes" 
	}); 
});