<style type="text/css">li a{ COLOR: #fff } .red{ BACKGROUND-COLOR: red } .blue{ BACKGROUND-COLOR: blue }</style>

{dede:arclist typeid='1' titlelen='40' row='20' typeid="" }<li [field:global name=autoindex runphp="yes"](@me % 2 == 0)?@me="class='red'":@me="class='blue'";[/field:global]> <a href="[field:arcurl/]">[field:title/]</a></li>{/dede:arclist}