// <a href="html-or.jpg" onclick="return popup(this,123,456)" title="..."
// or
// <a href="html-or.jpg" onclick="return popup(this)" title="..."
// popup function for frontend
var pop = null;

function popdown()
{
	if (pop && !pop.closed) pop.close();
}

function popup(obj,w,h)
{
	var url = (obj.getAttribute) ? obj.getAttribute('href') : obj.href;
	if (!url)
	   	return true;
	
	w = (w) ? w += 20 : 500;  // 150px*150px is the default size
	h = (h) ? h += 20 : 500;
	
	var args = 'width='+w+',height='+h+',resizable,scrollbars=yes';
	
	popdown();
	
	pop = window.open(url,'',args);
	return (pop) ? false : true;
}

window.click = popdown;
//window.onfocus = popdown;