function show_lightbox(t)
{
	bod 				= document.getElementsByTagName('body')[0];
	overlay 			= document.createElement('div');
	overlay.id			= 'overlay';
	lb					= document.createElement('div');
	lb.id				= 'lightbox';
	lb.innerHTML		= t;
				
	bod.appendChild(overlay);
	bod.appendChild(lb);
	
	document.getElementById('overlay').style.display = 'block';
	document.getElementById('lightbox').style.display = 'block';	
}

function close_lightbox()
{	
	document.getElementById('overlay').style.display = '';
	document.getElementById('lightbox').style.display = '';

	bod 				= document.getElementsByTagName('body')[0];
	overlay 			= document.getElementById('overlay');
	lb					= document.getElementById('lightbox');
				
	bod.removeChild(overlay);
	bod.removeChild(lb);		
}