Making the Accelerator Oscillator show as an arrow?

Can someone kindly help me change Accelerator Oscillator(AO) to show as arrows on chart. Will be more than grateful.
Heres the source code:

//+------------------------------------------------------------------+
//| Accelerator.mq4 |
//| Copyright 2005, MetaQuotes Software Corp. |
//| http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright 2005, MetaQuotes Software Corp."
#property link "http://www.metaquotes.net/"
//---- indicator settings
#property indicator_separate_window
#property indicator_buffers 3
#property indicator_color1 Black
#property indicator_color2 Green
#property indicator_color3 Red
//---- indicator buffers
double ExtBuffer0[];
double ExtBuffer1[];
double ExtBuffer2[];
double ExtBuffer3[];
double ExtBuffer4[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- 2 additional buffers are used for counting.
IndicatorBuffers(5);
//---- drawing settings
SetIndexStyle(0,DRAW_NONE);
SetIndexStyle(1,DRAW_HISTOGRAM);
SetIndexStyle(2,DRAW_HISTOGRAM);
IndicatorDigits(Digits+2);
SetIndexDrawBegin(0,38);
SetIndexDrawBegin(1,38);
SetIndexDrawBegin(2,38);
//---- 4 indicator buffers mapping
SetIndexBuffer(0,ExtBuffer0);
SetIndexBuffer(1,ExtBuffer1);
SetIndexBuffer(2,ExtBuffer2);
SetIndexBuffer(3,ExtBuffer3);
SetIndexBuffer(4,ExtBuffer4);
//---- name for DataWindow and indicator subwindow label
IndicatorShortName("AC");
SetIndexLabel(1,NULL);
SetIndexLabel(2,NULL);
//---- initialization done
return(0);
}
//+------------------------------------------------------------------+
//| Accelerator/Decelerator Oscillator |
//+------------------------------------------------------------------+
int start()
{
int limit;
int counted_bars=IndicatorCounted();
double prev,current;
//---- last counted bar will be recounted
if(counted_bars>0) counted_bars--;
limit=Bars-counted_bars;
//---- macd counted in the 1-st additional buffer
for(int i=0; i<limit; i++)
ExtBuffer3[i]=iMA(NULL,0,5,0,MODE_SMA,PRICE_MEDIAN,i)-iMA(NULL,0,34,0,MODE_SMA,PRICE_MEDIAN,i);
//---- signal line counted in the 2-nd additional buffer
for(i=0; i<limit; i++)
ExtBuffer4[i]=iMAOnArray(ExtBuffer3,Bars,5,0,MODE_SMA,i);
//---- dispatch values between 2 buffers
bool up=true;
for(i=limit-1; i>=0; i--)
{
current=ExtBuffer3[i]-ExtBuffer4[i];
prev=ExtBuffer3[i+1]-ExtBuffer4[i+1];
if(current>prev) up=true;
if(current<prev) up=false;
if(!up)
{
ExtBuffer2[i]=current;
ExtBuffer1[i]=0.0;
}
else
{
ExtBuffer1[i]=current;
ExtBuffer2[i]=0.0;
}
ExtBuffer0[i]=current;
}
//---- done
return(0);
}

Hello, you can try to replace "DRAW_HISTOGRAM" with "DRAW_ARROW" in your code, this should help

@FxMaestro..Thank for your reply. i tried it exactly the way your suggested but it didnt work..any other advice

It already exists:
http://www.desynced.net/fx/eas/mq4script-717.php