#maincenter {
width:34%;
float:left;
background:#fff;
padding-bottom:10px;
}
A much simpler and potentially more useful technique that then 4 column technique using float:left instead of position:absloute. It suffers from needing percentage widths for each column, and from potential column wrapping when the browser window is narrowed.
Scroll down for the source.
Enterprise engenderment accelerates initiative platforms, reducing staffing components, integration of technical accessibility, resulting in bottom line pluralisms, benefit-wise. Incidental re-sizing staff requirements through attrition can be accelerated by paridigm shifts and focusing on core suitability and cross-training.