function getStyle (id, prop) {
	var el = document.getElementById(id);
	if (el.currentStyle) {
		return el.currentStyle.display;
		}
	else if (document.defaultView && document.defaultView.getComputedStyle) {
		return document.defaultView.getComputedStyle(el, "").display;
		}
	else {
		return el.style[display];
		}
	}
function visible(id, disp) {
	if (getStyle(id,"display")!="none")	{
		document.getElementById(id).style.display="none";	
		}
	else {
		document.getElementById(id).style.display=disp;	
		}
	}
function blackout(url, alt){
	visible('blackout', 'block');
	document.getElementById("fullImg").setAttribute("src", url);
	document.getElementById("fullImg").setAttribute("alt", alt);
	document.getElementById("fullImg").setAttribute("title", alt);
	}