Add arrows to an EA (MQL4)

void drawArrow(string iName,int signal,int margin) {

 string name=iName+TimeToStr(Time[0],TIME_DATE|TIME_MINUTES|TIME_SECONDS);
 double p=0;

 if(signal>0) {
  p=Low[0]-margin*Point;
 }

 if(signal<0) {
  p=High[0]+margin*Point;
 }

 if(signal!=0) {

  if(ObjectFind(name)==-1) {
   ObjectCreate(name,OBJ_ARROW,0,Time[0],p);
  }

  ObjectSet(name,OBJPROP_PRICE1,p);

  if(signal>0) {
   ObjectSet(name,OBJPROP_ARROWCODE,241);
  }

  if(signal<0) {
   ObjectSet(name,OBJPROP_ARROWCODE,242);
  }
 }