help with alert on my macd indicator

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the arrows when the cross is made are working and appear fine. however i added an alert and it goes off non stop, which is obviously incorrect.

can someone look at it for me and tell me what to add/change thanks. im a newbie at this and learning all the time!

code:

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 SpringGreen
#property indicator_color2 Red

double CrossUp[];
double CrossDown[];
extern int FastEMA=12;
extern int SlowEMA=26;
extern int SignalSMA=40;
extern bool Alert_Enabled=true;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- indicators
SetIndexStyle(0, DRAW_ARROW, EMPTY);
SetIndexArrow(0, 233);
SetIndexBuffer(0, CrossUp);
SetIndexStyle(1, DRAW_ARROW, EMPTY);
SetIndexArrow(1, 234);
SetIndexBuffer(1, CrossDown);
//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//----

//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start() {
int limit, i, counter;
double MACD_Main, MACD_Signal, MACD_MainPrevious, MACD_SignalPrevious;
double Range, AvgRange;
int counted_bars=IndicatorCounted();
//---- check for possible errors
if(counted_bars<0) return(-1);
//---- last counted bar will be recounted
if(counted_bars>0) counted_bars--;

limit=Bars-counted_bars;

for(i = 0; i <= limit; i++) {

counter=i;
Range=0;
AvgRange=0;
for (counter=i ;counter<=i+9;counter++) {
AvgRange=AvgRange+MathAbs(High[counter]-Low[counter]);
}
Range=AvgRange/10;

MACD_Main = iMACD(NULL, 0, FastEMA, SlowEMA, SignalSMA, PRICE_CLOSE, MODE_MAIN, i);
MACD_MainPrevious = iMACD(NULL, 0, FastEMA, SlowEMA, SignalSMA, PRICE_CLOSE, MODE_MAIN, i+1);
MACD_Signal = iMACD(NULL, 0, FastEMA, SlowEMA, SignalSMA, PRICE_CLOSE, MODE_SIGNAL, i);
MACD_SignalPrevious = iMACD(NULL, 0, FastEMA, SlowEMA, SignalSMA, PRICE_CLOSE, MODE_SIGNAL, i+1);



if ((MACD_Signal < MACD_Main) && (MACD_SignalPrevious > MACD_MainPrevious)) {
CrossUp[i] = Low[i] - Range*0.5;
Alert ("MACD crossed up! ",Symbol());
}
else if ((MACD_Signal > MACD_Main) && (MACD_SignalPrevious < MACD_MainPrevious)) {
CrossDown[i] = High[i] + Range*0.5;
Alert ("MACD crossed down! ",Symbol());
}
}
return(0);
}