jule,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
</head>
<body>
<style type="text/css">
.link{
position:absolute;
border:1px solid #000000;
width:100px;
}
</style>
<div id="menu"><div class="link">First</div><div class="link">Second</div><div class="link">Third</div></div>
<script>
function f(space){
var i = 0, divs = document.querySelectorAll('.link');
len = divs.length , w = 0;
for (var i=0; i<len; i++) {
var elem = divs[i], computedStyle = window.getComputedStyle ? getComputedStyle(elem, '') : elem.currentStyle;
elem.style.left = w + (space* i) + "px";
w += parseFloat(computedStyle.width);
}
}
f(15);
</script>
</body>
</html>