I think this is what you're asking for. It required jQuery though.
http://jsfiddle.net/sKPLQ/3/
CSS:
ul {
width: 800px;
}
li {
display: inline-block;
float:left;
}
JS:
var evenWidth = $(".list").width()/$(".list li").size();
$(".list li").css("width", evenWidth);
HTML:
- Item 1
- Item 2
- Item 3
- Item 4