[LifesGreatestGift]

then general guide would be

<vb:if condition="$post['itrader_total'] > '0'">
<!-- if itrader total greater than 0 -->
<font color="green">{vb:raw post.itrader_total}</font>
<vb:elseif condition="$post['itrader_total'] < '0'">
<!-- if itrader total less than 0 -->
<font color="red">{vb:raw post.itrader_total}</font>
<vb:elseif condition="$post['itrader_total'] == 0">
<!-- if itrader total equals 0 -->
<font color="black">{vb:raw post.itrader_total}</font>
</vb:if>