求个ie7样式的问题

错误图：

就是每一个div设置的height：auto根本没有撑开

html代码：

<ul>
                                <li style="background: url(images/leftbg1.jpg) no-repeat ! important; font-weight: 600;
                                    color: #b47220;">
                                    <div class="l_t1">
                                        <img src="images/jh.png" /></div>
                                    <div class="l_t2">
                                        <a>
                                            欧洲系列</a></div>
                                </li>
                                <div class="l_xl">
                                    <ul>
                                        
                                                <li>
                                                    <div class="l_t3">