Horizontal menu that resizes nicely

I'm struggling with the following horizontal menu:

http://jsfiddle.net/UeFeb/

I'd like each <li> item in the menu to be separated by a backslash. I've based my menu on this method: https://stackoverflow.com/a/6880421/556006

How can I get the menu to:

Have the slashes sit in the negative space between each <li> element so that they always sit in between each subsequent <li>
When the browser width drops below 730px, automatically resize to 2 rows of 3 <li> items (at the moment it drops one <li> down at a time as the browser width is reduced)

Thoughts?

You can add the slashes automatically with CSS like so:

#menu li:after {
    content: "\0020 \002F";
}

And as for the resizing you can sorta fake it using @media queries for that. Take a look at this demo (readjust as necessary):

http://jsfiddle.net/andresilich/UeFeb/1/

Reworked my answer into a more satisfactory one, here is the breakdown for future users:

HTML

<ul id="menu" style="list-style:none">
     <li><a href="#asics">ASICS</a></li>
     <li>/</li>
     <li><a href="#plants">PLANTS PLUS</a></li>
     <li>/</li>
     <li><a href="#tooheys">TOOHEYS</a></li>
     <li>/</li>
     <li><a href="#olympics">OLYMPICS</a></li>
     <li>/</li>
     <li><a href="#panadol">PANADOL</a></li>
     <li>/</li>
     <li><a href="#kia">KIA CADENZA</a></li>
</ul>

CSS

#menu {
    height: 125px;
    margin: 0 auto;
    text-align: justify;
    -ms-text-justify: distribute-all-lines;
    text-justify: distribute-all-lines;

    /* just for demo */
    min-width: 90%;
}

#menu li {
    max-width: 150px;
    vertical-align: top;
    display: inline-block;
    *display: inline;
    zoom: 1
}

#menu:after {
    content: '';
    width: 100%;
    display: inline-block;
    font-size: 0;
    line-height: 0
}

@media screen and (max-width:730px) {
    #menu {
        min-width: 1px;
        width: 35%;
    }
}

http://jsfiddle.net/andresilich/UeFeb/3/