Nick,
Try change your .spacer class in your style sheet to:
.spacer {border-top: 1px solid buttonshadow; border-left: 1px solid buttonshadow; border-bottom: 1px solid buttonhighlight; border-right: 1px solid buttonhighlight;width:2px;margin-left:2px;margin-right:2px;height:18px;VERTICAL-ALIGN: middle;}
Kee me posted.
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