aligning text horizontially in a fo:table-cell

Hi,

I want to in a fo:table-cell, align text horizontially on top and bottom.

If i place a display-align property on the table cell and set the value
"before" or "after" it puts both the two text-block on top or bottom.

But what i am looking for is to set one of the blocks on top and the other
one on the bottom. Is there any way this is possible ?

<fo:table-cell display-align="after" >
<fo:block>Align on top</fo:block>
<fo:block>Align on bottom</fo:block>
</fo:table-cell>


Thanks.
Ali