function dyn_workshop_checkParticipants(sender) {
	if(document.dyn_workshop_form_course != undefined) {
		participants = document.dyn_workshop_form_course.elements;
		checked = false;
			for (i = 0; i < participants.length; i++) {
				if (participants[i].checked && !participants[i].disabled) {
					checked = true;
				}
			}
		document.getElementById('dyn_workshop_submitLink').style.visibility = checked ? 'visible' : 'hidden';
	}
}
dyn_workshop_checkParticipants();