var sc = 0;

function showImage(src)
{
	var dark = document.createElement('DIV');
	dark.id='dark';
	document.body.appendChild(dark);
	registerEventHandler(dark,'mousedown',hideImage);
	var imgEl = document.createElement('IMG');
	imgEl.src=src;
	imgEl.id='fullImage';
	document.body.appendChild(imgEl);
	registerEventHandler(imgEl,'load',setCenter);
	registerEventHandler(imgEl,'mousedown',hideImage);
	if(sc==0)setCenter();
}

function hideImage()
{ 
	document.body.removeChild(el('dark'));
	document.body.removeChild(el('fullImage'));
	sc = 0;
}

function setCenter()
{
	sc = 1;
	var imgEl = el('fullImage');
	imgEl.style.left=Math.round((document.body.clientWidth - imgEl.offsetWidth) / 2)+'px';
	imgEl.style.top=Math.round((document.body.clientHeight - imgEl.offsetHeight) / 2)+'px';
}