<div style="width:300px; border:0px solid yellow;">
<div style="width:100px; border:0px solid red;float:left">Left</div>
<div style="width:100px;border:0px solid black; float:left">Center</div>
<div style="width:100px;border:0px solid green;float:right">Right</div>
</div>
Kansnt die Border löschen, dienen nur der besseren Ansicht.