I need to be able to increment a variable to put along side each archive link for my menu system to work.  It should look like the following after output:

menuitem_1='archive febuary'
menuitem_2='archive january'

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I read the documentation and it stated that you could set variables and what not, but I couldn't figure out how to increment them.

Does anyone know how to do this?  Maybe using variables isnt' the way and there is an easier way?