Need help creating indicator w/ two different y-axis scales

Hi, I am designing Indicator to plot graph of High of two Symbols( EURUSD, USDJPY).
Problem is that.
- Indicator Plots High of both symbols as straight line.( It think it is due to scaling factor of both currencies are different.)
I like to see both symbols crossing inside indicator window.( in between -1 to +1)
Help me to plot both symbols with different Price scaling. If normalization is required then how.?
EURUSD Scaling range( 1.3499 to 1.3467)
USDJPY Scale Range (105.6445 to 100.9695)
Code is below.


//***********************************************************************************************
#property indicator_separate_window
#property indicator_buffers 2
#property indicator_color1 Blue
#property indicator_color2 Red
//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0,ExtMapBuffer1);
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1,ExtMapBuffer2);
return(0);
}

//+------------------------------------------------------------------+
//| Custom indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
return(0);
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int limit;
int counted_bars=IndicatorCounted();
//---- check for possible errors
if(counted_bars<0) return(-1);
//---- the last counted bar will be recounted
if(counted_bars>0) counted_bars--;
limit=Bars-counted_bars;
//---- main loop
double aa[5000],bb[5000],cc[5000],dd[5000];
for(int i=0; i<limit; i++)
{

ExtMapBuffer1[i] = (iHigh("EURUSD", NULL,i));
ExtMapBuffer2[i] = (iHigh("USDJPY", NULL,i);
}

return(0);
}

//***********************************************************************************************