Files without a link ([[File:Wiki.png|link=|description]]) has no tooltips in FireFox, but in IE7.
IE7 shows the alt-attribut when hover over the file. FireFox shows only title-attributs. By linked files that title-attribut came from the a-tag, by unlinked files it is missing.
Please add a title-attribut to the img-tag of unlinked files, so FireFox can show a tooltip. Thanks.