Setting request scope variables from within macro

Hi,

I'm trying and failing to set a request scope variable from within a macro.

I've tried
<#global delayPhoto = 0>
<#macro delayedPhoto photo path type="thumb" >
	<#if (.globals.delayPhoto > 0)>
		<#global delayPhoto = .globals.delayPhoto + 1>
	<#else>
		<#global delayPhoto = 1>
[...]

<#global delayPhoto = 0>
<#macro delayedPhoto photo path type="thumb" >
	<#if (delayPhoto > 0)>
		<#global delayPhoto = delayPhoto + 1>
	<#else>
		<#global delayPhoto = 1>
[...]

and some other variations but delayPhoto always 
remain 0 when the macro is called.

How do I set a request scope variable from within a macro?


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