[Hellcat]

Try this:

<if condition="$myalternate == 1">
  ... code A ...
  <if condition="$myalternate = 0"></if>
<else />
  ... code B ...
  <if condition="$myalternate = 1"></if>
</if>

Note that there are only SINGLE equal signs ("... = ...") in the secondary IFs and the usual double ones ("... == ...") in the first one.


[EDIT]
This may not work on the first try, depending on how the single bits are assembled (all in one function call, or each in seperate function call), so may want to find a variable with global scope you can use/hijack.

For posts inside a thread, for example, you could use the $thread array ($thread[myalternate]) to keep your value between posts....