Indicator Programming Adjustment

Can somehere here kindly assist me in correcting the MQL contained here in the indicator? The indicator is supposed to alert immediately the Awesome Oscillator crossed 0 to positive with the previous below 0 and vice versa.

Someone got it programmed wrongly and it only alert for buy and even if it does it keeps beeping by every tick.

Your contribution will be most appreciated.


//+------------------------------------------------------------------+
//| Awesome.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[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- drawing settings
SetIndexStyle(0,DRAW_NONE);
SetIndexStyle(1,DRAW_HISTOGRAM);
SetIndexStyle(2,DRAW_HISTOGRAM);
IndicatorDigits(Digits+1);
SetIndexDrawBegin(0,34);
SetIndexDrawBegin(1,34);
SetIndexDrawBegin(2,34);
//---- 3 indicator buffers mapping
SetIndexBuffer(0,ExtBuffer0);
SetIndexBuffer(1,ExtBuffer1);
SetIndexBuffer(2,ExtBuffer2);
//---- name for DataWindow and indicator subwindow label
IndicatorShortName("AO");
SetIndexLabel(1,NULL);
SetIndexLabel(2,NULL);
//---- initialization done
return(0);
}
//+------------------------------------------------------------------+
//| Awesome 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
for(int i=0; i<limit; i++)
ExtBuffer0[i]=iMA(NULL,0,5,0,MODE_SMA,PRICE_MEDIAN,i)-iMA(NULL,0,34,0,MODE_SMA,PRICE_MEDIAN,i);
//---- dispatch values between 2 buffers
bool up=true;
for(i=limit-1; i>=0; i--)
{
current=ExtBuffer0[i];
prev=ExtBuffer0[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;
}
}

if (current>prev)
{
if ((current>prev) && (current>0) && (prev<0)) Alert("Awesome Oscillator"+" crossed up");
}
else
{
if ((current<prev) && (current<0) && (prev>0)) Alert("Awesome Oscillator"+" crossed down");
}
//---- done
return(0);
}
//+------------------------------------------------------------------+