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ul.my_tree, ul.my_tree ul {
list-style-type: none;
margin: 0;
padding: 0;
}
ul.my_tree li{
margin: 0 5px 0 15px;
padding: 0 5px;
line-height: 31px;
display:inline
}
ul.my_tree .vline{
background: url(images/vline.png) repeat-y;
}
ul.my_tree .blank {
margin-left: 15px;
}
ul.my_tree .node {
background: url(images/node.png) no-repeat;
}
ul.my_tree .last-child {
background: #fff url(images/lastnode.png) no-repeat;
}
<ul class="my_tree">
<ul>node_1</ul>
<ul><li class="node"></li>node_1_1</ul>
<ul><li class="vline"></li><li class="node"></li>node_1_1_1</ul>
<ul><li class="vline"></li><li class="node"></li>node_1_1_2</ul>
<ul><li class="last-child"></li>node_1_2</ul>
</ul>