function goPhoto(num) {
	$('.product_photos_colonna img').removeClass('selected');
	$('.product_photos_colonna img').css({ opacity: 0.5 });
	$('#photo' + num).addClass('selected');
	$('#photo' + num).css({ opacity: 1 });
	$('#product_photo .text').text(prod_text[num]);
	$('#product_photo img').attr('src',prod_zoom[num]);
	$('#product_photos_container .download150dpi a.prodlink150').attr('href',prod_150dpi[num]);
}