AssetIsFirstInRow
A conditional tag that displays its contents if the asset in context is the first item in the row in context when publishing a grid of assets (e.g. thumbnails). Grid of assets can be created by specifying assets_per_row attribute value to Assets block tag.
For example, the first, the fourth and the seventh asset are the first assets in row when Assets iterates eight assets and assets_per_row is set to "3".
Example:
<table>
<mt:Assets type="image" assets_per_row="4">
<mt:AssetIsFirstInRow><tr></mt:AssetIsFirstInRow>
<td><$mt:AssetThumbnailLink$></td>
<mt:AssetIsLastInRow></tr></mt:AssetIsLastInRow>
</mt:Assets>
</table>