List Items on same line in drop down menu

Question

I have a drop down menu where I want some of the list items to be in one line.

See demo

You will notice that under Tab One, there are 9 rows. I want there to be three rows with three items in each row. How can this be done in CSS?

HTML:

<div id="wrapper">
    <ul id="menu">
        <li><a href="#">Tab One</a>
            <ul style="width: 300%;">
                <li><a href="#">Column one</a></li>
                <li><a href="#">Column one</a></li>
                <li><a href="#">Column one</a></li>

                <li><a href="#">Column two</a></li>
                <li><a href="#">Column two</a></li>
                <li><a href="#">Column two</a></li>

                <li><a href="#">Column three</a></li>
                <li><a href="#">Column three</a></li>
                <li><a href="#">Column three</a></li>
            </ul>
        </li>
        <li><a href="#">Tab Two</a>
            <ul style="position: relative; left: -100%; width: 300%">
                <li><a href="#">Tab 2</a></li>
                <li><a href="#">Tab 2</a></li>
                <li><a href="#">Tab 2</a></li>
            </ul>
        </li>
        <li><a href="#">Tab Three</a>
            <ul style="position: relative; left: -200%; width: 300%">
                <li><a href="#">Tab 3</a></li>
                <li><a href="#">Tab 3</a></li>
                <li><a href="#">Tab 3</a></li>
            </ul>
        </li>
    </ul>
</div>

CSS:

body {
    font-family: arial;
    margin: 0px;
    padding-left: 40px;
    padding-right: 40px;    
}

#wrapper {
    text-align: center;
    height: auto;
    margin: auto;
    min-width: 500px;   
}

#wrap {
    display: inline;
}

ul {
    font-family: Arial, Verdana;
    font-size: 14px;
    margin: 0;
    padding: 0;
    list-style: none;
}

#menu > li {
    display: block;
    position: relative;
    float: left;
    width: 33.3%;
}


li ul {
    display: none;
}

ul li a {
    display: block;
    text-decoration: none;
    color: #ffffff;
    border-top: 1px solid #ffffff;
    padding: 5px 15px 5px 15px;
    background: #1e7c9a;
    margin-left: 1px;
    white-space: nowrap;
}

ul li a:hover {
background: #3b3b3b;
}

li:hover ul {
    display: block;
    position: absolute;
}

li:hover li {
    float: none;
    font-size: 14px;
}

li:hover a { 
    background: #3b3b3b;
}

li:hover li a:hover {
    background-color: black;
    opacity: .7;
}

Answer 1

Working example: http://jsfiddle.net/w7a3N/5/

Remove > from #menu > li { and set inner <li> to <li style="width: 33%;">

Not sure if the style="width:33%;" is absolutely necessary since it works in Firefox 20 without it, but just to be safe.

UPDATE

You asked for a version that only does multiple columns under the first tab. Here you go:

http://jsfiddle.net/w7a3N/6/

Gave First tab an id like so <ul id="tab1" and then added this to CSS:

#tab1 li{
    display: block;
    position: relative;
    float: left;
    width: 33%;
}