function clearField(field,defaultValue){
	
	var formField = document.getElementById(field);
	
	if (formField.value == defaultValue){
		formField.value = '';
	}
	else if (formField.value == ''){
		formField.value = defaultValue;
	}
	
}

function eventRegister(id){
	document.getElementById('event_'+id).checked = true;
	document.getElementById('register_image_'+id).innerHTML = '<img src="/images/form-elements/registered-btn.gif" align="absmiddle" />';
	document.getElementById('unregister_link_'+id).style.display = 'inline';
}

function eventUnregister(id){
	document.getElementById('event_'+id).checked = false;
	document.getElementById('register_image_'+id).innerHTML = '<img src="/images/form-elements/register-btn.gif" align="absmiddle" />';
	document.getElementById('unregister_link_'+id).style.display = 'none';
}

function showContainer(id){
	
	var fullID = id+'_container';
	var linkName = id+'_link';
	
	if (document.getElementById(fullID).style.display == 'none'){
		document.getElementById(fullID).style.display = 'block';
		document.getElementById(linkName).innerHTML = 'Hide';
	}
	else {
		document.getElementById(fullID).style.display = 'none';
		document.getElementById(linkName).innerHTML = 'View';
	}
}

function toggleVisibility(id){
	
	if (document.getElementById(id).style.display == 'none'){
		document.getElementById(id).style.display = 'block';
	}
	else {
		document.getElementById(id).style.display = 'none';
	}
}