I need help regarding nth-child's

[Spredogrek]

Was never good with nth-child, other than :first-child and :last-child , but I need some help creating this type of layout:

Each "post" will be wrapped in a div class called .summary-item I'm using a fluid layout and have my site's content width to max-width: 1020pxCan anyone help me out here? Much appreciated! \[code\]<div class="summary-item">First Post</div><div class="summary-item">Second</div><div class="summary-item">Third</div><div class="summary-item">Fourth</div><div class="summary-item">Fifth</div>\[/code\]Then rinse and repeat.