function onOpenLargeImage( evt ) {
	var target = evt.currentTarget;
	var path_elements = target.src.split("/");
	path_elements[path_elements.length - 2] = "_large";
	var new_path = path_elements.join("/");
	var win = window.open(new_path, "big_image", "location=0,statusbar=0,menubar=0,width=730,height=800");
	win.focus();
	evt.preventDefault();
}

function onLoad( evt ) {
	mlisten(
		'click',
		document.getElementById('poster').getElementsByTagName('img'),
		onOpenLargeImage
	);	
}

listen('load', window, onLoad);