how to assign more than one class

either double the code and make one with ‘left’,'right’,center’ instead of ‘one’,'two’,'three’; in which case you could even use two cycles with different numbers of elements, therefor getting an asynchroneous formatting. or use the existing one and build your styles on it; example: .one img {float:left;} .two img {float:right;} .three img { display:block;margin:0 auto;}
and you can add these new classes into the ‘post_class()’ as described in my other post.

for more details, it would be better to have a specific example to work with.

e.g. <?php $c++;
if( $c % 2 == 0 ) $bg = ' ' && $arrow = 'leftarrow';
else $bg = 'alt-color' && $arrow = 'rightarrow'; ?>

e.g.

so one post will show a not only an alternative background colour but also a differnt arrow image (left or right)

Thanks Again,

Alex