function toggle(id) {

	var object = document.getElementById(id);

	if ( object == null ) { return; }

	var objectDisplay = object.style.display == '';
	object.style.display = (objectDisplay ? 'none' : '');
}



 
function disp_show(id) {

	var div = document.getElementById(id);
	div.style.display = '';
}

function disp_hide(id) {

	var div = document.getElementById(id);
	div.style.display = 'none';
}


function toggleThumbnail(obj) {
	var el = document.getElementById(obj);
	el.className = (el.className != 'thumbnail' ? 'thumbnail' : 'thumbnailChecked' );

}

function toggleCheckbox(obj) {
	var checkbox = document.getElementById(obj);
	
	if( checkbox.checked == true )	{	checkbox.checked = false; }
	else	{							checkbox.checked = true; }
	
}