At any time, when you have several elements, be sure to use the additional classes alpha and omega.
Alpha is for the first element, and omega is for the last. These classes specify a valid marker of 0.
See the updated script: http://jsfiddle.net/7Eq4e/1/
and css, which include:
.alpha { margin-left: 0; } .omega { margin-right: 0; }
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