If you use a regular unordered list menu (like Housemenu) and make it horizontal, it will show a double row automatically if you limit the menu's conainer width.
I'l give an axample with Divs for LIs it's the same, and I use inline styles because that's all I can do in the editor
Example floating width not limited:
example
example
example
example
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example
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example
Code:
<div style="padding: 3px; float: left; background-color: rgb(221, 221, 221);">
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="clear: both; height: 0px;"> </div>
</div>
Example fixed width for container:
example
example
example
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example
Code:
<p>Example width fixed width for container:</p>
<div style="padding: 3px; float: left; background-color: rgb(221, 221, 221); width: 400px;">
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="margin: 1px; padding: 3px; background-color: rgb(255, 136, 0); width: 100px; float: left;">example</div>
<div style="clear: both; height: 0px;"> </div>
</div>