Add Circle Image Style to Popular Posts-2

<b:widget id='PopularPosts1' locked='false' title='Popular Posts' type='PopularPosts'>
    <b:includable id='main'>
        <b:if cond='data:title'>
            <h2>
                <data:title/>
            </h2>
        </b:if>
        <div class='widget-content popular-posts'>
            <ul>
                <b:loop values='data:posts' var='post'>
                    <dd>
                        <b:if cond='data:showThumbnails == &quot;false&quot;'>
                            <b:if cond='data:showSnippets == &quot;false&quot;'>
                                <!-- (1) No snippet/thumbnail -->
                                <a expr:href='data:post.href'><data:post.title/></a>
                                <b:else/>
                                <!-- (2) Show only snippets -->
                                <div class='item-title'>
                                    <a expr:href='data:post.href'><data:post.title/></a>
                                </div>
                                <div class='item-snippet'>
                                    <data:post.snippet/>
                                </div>
                            </b:if>
                            <b:else/>
                            <b:if cond='data:showSnippets == &quot;false&quot;'>
                                <!-- (3) Show only thumbnails -->
                                <div class='item-thumbnail-only'>
                                    <b:if cond='data:post.thumbnail'>
                                        <div class='item-thumbnail'>
                                            <a expr:href='data:post.href' target='_blank'>
<img alt='' border='0' expr:height='data:thumbnailSize' expr:src='data:post.thumbnail' expr:width='data:thumbnailSize'/>
</a>
                                        </div>
                                    </b:if>
                                    <div class='item-title'>
                                        <a expr:href='data:post.href'><data:post.title/></a>
                                    </div>
                                </div>
                                <div style='clear: both;' />
                                <b:else/>
                                <!-- (4) Show snippets and thumbnails -->
                                <b:if cond='data:post.thumbnail'>
                                    <a expr:href='data:post.href' expr:title='data:post.title' rel='bookmark'><img expr:alt='data:post.title' expr:src='data:post.thumbnail' height='60px' width='60px'/></a>
                                    <b:else/>
                                    <a expr:href='data:post.href' expr:title='data:post.title' rel='bookmark'><img alt='no image' height='60px' src='http://3.bp.blogspot.com/-yIv8Rn_rvvA/T6-sigEHCYI/AAAAAAAABvY/BepU32JUC5g/s1600/helperblogger-default-image.jpg' width='60px'/></a>
                                </b:if>
                            </b:if>
                        </b:if>
                    </dd>
                </b:loop>
            </ul>
            <div class='clear' />
            <b:include name='quickedit' />
        </div>
    </b:includable>
</b:widget>