function switchImg(img) {
	var imgs = document.getElementsByTagName('img');
	for (var i=0; i<imgs.length; i++) {
		if (imgs[i].className == 'imagesBorderSelected') {
			imgs[i].className = 'imagesBorder';
		}
	}
	var sourceimg = document.getElementById("sourceimg");
	sourceimg.src = img.src.replace(/_thumb/,"");
	img.className = "imagesBorderSelected";
}