<script type="text/javascript" charset="utf-8">
 
	$(document).ready(function(){
 
		mandatoryCol(QQ);
 
		function mandatoryCol(qID) {
 
			var msg = 'Please select an item in each column.';
 
			// Interrupt next/submit function
			$('form#limesurvey').submit(function(){
 
				var advance = 0;
 
				// Add column-specific classnames to radio cells
				$('#question'+qID+' table.question tbody tr').each(function(i) {
					$('td', this).each(function(i) {
						$(this).addClass('ansCol'+Number(i+1));
					});
				});
 
				$('#question'+qID+' table.question thead th').each(function(i) {
					// Add column-specific classnames to header cells
					var newClass = 'ansCol'+Number(i+1);
					$(this).addClass(newClass);
 
					// Count checked radios in each column - set flag if none found
					if ($('#question'+qID+' td.'+newClass+' input.radio:checked').length == 0) {
						advance = 1;
						$('.'+newClass).css({'background': 'pink'});
					}
					else {
						$('.'+newClass).css({'background': ''});
					}
				});
 
				// If flag set, alert and cancel next/submit
				if(advance == 1) {
					alert (msg);
					return false;
				}
				// Otherwise, carry on with next/submit
				else {
					return true;
				}
			});
		}
 
	});
 
</script>