better zoom in/out cursors

[numist]

WebKit and Gecko both provide their own, using -webkit-zoom-in/out and -moz-zoom-in/out, but you can't set them both in the same css line, so applying them correctly will have to take the form of:

$("#zoom-in").css('cursor', function() {
    if (jQuery.browser.mozilla) {
        return '-moz-zoom-in';
    }
    else if (jQuery.browser.webkit) {
        return '-webkit-zoom-in';
    }
    else {
        return cursor_zoom_in;
    }
});

[numist]

fixed in 3e3ee14