indicator code help

[Jdev02@xxxxxxx]

I'm trying to plot an indicator for Larry Williams "Greatest Swing Value" 
(GSV). 

GSV Buy: 
(( (high[3] - open[3]) + (high[2] - open[2] + (high[1] - open[1]) + (high - 
open)) / 4) * 1.30 + nOpen Stop; 

GSV Sell: 
(( (Open[3] - Low[3]) + (Open[2] - Low[2]) 
+ (Open[1] - Low[1]) + (Open - Low)) / 4) * 1.80 Stop; 


It seems that I need a buy & sell line in the indicator. Any help would be 
appreciated........  jdev02@xxxxxxx