centered “row” content with Bootstrap(twitter)

[Chronik]

i have a problem to center the content in a "row", the buttons in the example are always on the left side and i have too much space on the right side. Is there a way to center this buttons?thxtomas\[code\]<div class="abc"><div class="row red show-grid"> <div class="span2 btn">a</div> <div class="span2 btn">b</div> <div class="span2 btn">c</div> <div class="span2 btn">d</div> <div class="span2 btn">e</div></div>\[/code\]