[amibroker] Convert Metastock indicator with PREV function into AFL

[loshude8888]

Dear Members,

Following is a METASTOCK indicator, how can we write this indicator 
into AFL?

If((C*.97)>PREV,C*.97,If((C*1.03)<PREV,C*1.03,PREV))

Thanks in advance.

Regards,
Lokesh