Stop-loss Indicator Bands for Amibroker (AFL)

/* Stop Loss indicator  */
/* AFL code by Prakash Shenoi */

/* Simple stop-loss bands calculated by ATR periods (Variable) with highest
high and lowest Low value 
over (variable) the preceding periods. Stop loss level for short positions
deduced from
highest high value periods and Stop Loss for longs fm Lowest low value periods.
*/

pdsshort=Param("pds short",1,10,55);
pdslong=Param("pds long",1,10,55);
Ststop=HHV(H,pdsshort)-ATR(pdsshort);
Lgstop=LLV(L,pdslong)+ ATR(pdslong);
Plot (Close,"Close",colorBlack,styleCandle);
Plot (Ststop," SL for shorts ",colorGreen,styleDots|styleNoLine);
Plot (Lgstop," SL for longs ",colorRed,styleDots|styleNoLine);