[xsl] Show a column only if the total is not zero

["Richard Huxtable" <huxtabler@xxxxxxxxx>]

The costs on a project look like this.

<person>
   <name>Adam</name>
   <fees>134.25</fees>
   <overtime>0.00</overtime>
   <travel>39.25</travel>
</person>
<person>
   <name>Brian</name>
   <fees>172.50</fees>
   <overtime>0.00</overtime>
   <travel>52.75</travel>
</person>
<person>
   <name>Chris</name>
   <fees>103.75</fees>
   <overtime>0.00</overtime>
   <travel>0.00</travel>
</person>

I would like the report on the project to look like this.

name		fees		travel
Adam		134.25		39.25
Brian		172.50		52.75
Chris		103.75		0.00
Total		410.50		92.00

There was no overtime on this project so I don't want it shown. I should
be most grateful for any suggestions on the best way to show the columns
where the total is not zero. (In practice I have more than 3 types of
cost.) 
Many thanks.