// JavaScript Document

function preview(a_id, div_id) {
	div = document.getElementById(div_id);
	a = document.getElementById(a_id);
	if ((div.style.visibility == "") || (div.style.visibility == "hidden")) {
		div.style.visibility = 'visible'; 
		div.style.display = 'block'; 
		
	}
	else {
		div.style.visibility = 'hidden'; 
		div.style.display = 'none'; 
	}
}