How to alternate colors in postbit_legacy?

[CycoreFredde]

Hi!

I already have this style in my current forum, and I want the same look when upgrading to 3.7, I got some help to do this the last time, but now i dont know ho to do it again =)

I want the first post in postbit_legacy to use alt1, and the second post to use alt2, the third alt1 and so on...
Here's a link to how it should look: http://www.zatzy.com/street-racing-g...rally-car.html

We used some programming to find out wether the post number is odd or even, but i don't know how to do this again (I didn't do it myself the first time).
Please give me some help

Best regards

Fredrik

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nobody?