function init(){ document.body.onclick = enlargeImg; }

function enlargeImg(ev){
	ev = ev || window.event;
	var target = ev.target || ev.srcElement;
	
	if( target.tagName != 'borderimage' && target.getAttribute('enlarge') != 'true' )  return;
	
	var imgExt = target.src.slice(-4);
	var imgLg  = target.src.replace(imgExt, '_lg' + imgExt);

	TB_show(target.alt, imgLg);
}

window.onload = init;