function onShowMediumImage( evt ){
	if (document.images) {
		var target = evt.currentTarget;
		document.images["mainImage"].src = target;
		evt.preventDefault();
	}
}

function onOpenLargeImage( evt ) {
	var target = evt.currentTarget;
	var path_elements = target.src.split("/");
	path_elements[path_elements.length - 2] = "big";
	var new_path = path_elements.join("/");
	var win = window.open(new_path, "big_image", "location=0,statusbar=0,menubar=0,width=530,height=811");
	win.focus();
	evt.preventDefault();
}

function onLoad( evt ) {
	mlisten(
  		'mouseover',
  		document.getElementById('thumbs').getElementsByTagName('a'),
  		onShowMediumImage
	);
	mlisten(
  		'click',
  		document.getElementById('thumbs').getElementsByTagName('a'),
  		onShowMediumImage
	);
}

listen('load', window, onLoad);