IIf in plugin for arrays

How to use IIf function in plugin for array ?
Sth like that in afl:

AddColumn(A,"A",1.1,fgcolor=IIf(A>70,colorRed, IIf(A<30, colorGreen,0)));

where A is an array.

Recommended reading:
http://www.amibroker.com/guide/h_understandafl.html

Also, don't rewrite AFLs to DLLs, it is bad idea: 5 reasons why you should NOT write DLLs

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