Finding Range over all bars in a chart for N periods...High to Lowest ???

[Forex Trader]

int limit, records, N=2;
int counted_bars = IndicatorCounted();
limit = Bars - counted_bars;
if ( counted_bars < 0 ) return(0);
if ( counted_bars ==0 ) limit=Bars-1;
double JPY;

for(int i = 0; i < limit; i++)
{
JPY = (iHigh("USDJPY", 0, i) - Low[iLowest("USDJPY", 0, MODE_LOW, N, i )] );
}

I am trying to find the range from the current bar high to the lowest low over N periods, Including current bar,,,the above does seam to work ??

Does not like pulling up USDJPY data or having iHigh and ilowest on the same line...

IHigh gives me 120.56 where as Low(iLowest[]) gives me 1.3201

Any ideas...