Remove duplicates from array

Hi, how do I remove duplicate values from an array? I have tried to add a check to stop it adding duplicate values in the first place - but this doesn't seem to work.

//+------------------------------------------------------------------+
//|                                                      ProjectName |
//|                                      Copyright 2012, CompanyName |
//|                                       http://www.companyname.net |
//+------------------------------------------------------------------+
#property indicator_chart_window 

input int barstocount=100;
double levels[];
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int init()
  {
   ObjectDelete(0,"SR1");
   ObjectDelete(0,"SR2");
   ObjectDelete(0,"SR3");
   ObjectDelete(0,"SR4");
   ObjectDelete(0,"SR5");
   ObjectDelete(0,"SR6");
   return(0);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int deinit()
  {
   ObjectDelete(0,"SR1");
   ObjectDelete(0,"SR2");
   ObjectDelete(0,"SR3");
   ObjectDelete(0,"SR4");
   ObjectDelete(0,"SR5");
   ObjectDelete(0,"SR6");
   return(0);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int start()
  {
   DoChecks();
   return(0);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void DoChecks()
  {
   double PriceCheck;

   ArrayResize(levels,0);

   for(int i=1;i<barstocount-1;i++)
     {
      //Check Top Break
      if(High[i]>High[i+1])
        {
         PriceCheck=High[i];
         for(int j=i+1;j<100;j++) //Lets look backwards for a tail
           {
            if(PriceCheck>Low[j] && PriceCheck<High[j])
              {
               if((PriceCheck>Close[j] && PriceCheck>Open[j]) || 
                  (PriceCheck<Close[j] && PriceCheck<Open[j]))
                 {
                  for(int k=i-1;k>0;k--)//we found a tail backwards, now lets look for a body forwards
                    {
                     if(PriceCheck>Low[k] && PriceCheck<High[k])
                       {
                        if((PriceCheck>Open[k] && PriceCheck<Close[k]) || 
                           (PriceCheck<Open[k] && PriceCheck>Close[k]))
                          {
                           bool adds=true;
                           for(int v=0;v<ArraySize(levels);v++)
                             {
                              if(levels[v]==NormalizeDouble(PriceCheck,Digits))
                                 adds=false;
                                 break;
                             }
                           if(adds==true)
                             {
                              ArrayResize(levels,ArraySize(levels)+1);
                              levels[ArraySize(levels)-1]=NormalizeDouble(PriceCheck,Digits);
                             }
                          }
                        else
                          {
                           break;
                          }
                       }
                    }
                 }
               else
                 {
                  break;
                 }
              }
           }
        }
      //Check Bottom Break
      if(Low[i]<Low[i+1])
        {
         PriceCheck=Low[i];
         for(int o=i+1;o<Bars;o++) //Lets look backwards for a tail
           {
            if(PriceCheck>Low[o] && PriceCheck<High[o])
              {
               if((PriceCheck>Close[o] && PriceCheck>Open[o]) || 
                  (PriceCheck<Close[o] && PriceCheck<Open[o]))
                 {
                  for(int u=i-1;u>0;u--)//we found a tail backwards, now lets look for a body forwards
                    {
                     if(PriceCheck>Low[u] && PriceCheck<High[u])
                       {
                        if((PriceCheck>Open[u] && PriceCheck<Close[u]) || 
                           (PriceCheck<Open[u] && PriceCheck>Close[u]))
                          {
                           bool add=true;
                           for(int g=0;g<ArraySize(levels);g++)
                             {
                              if(levels[g]==NormalizeDouble(PriceCheck,Digits))
                                 add=false;
                                 break;
                             }
                           if(add==true)
                             {
                              ArrayResize(levels,ArraySize(levels)+1);
                              levels[ArraySize(levels)-1]=NormalizeDouble(PriceCheck,Digits);
                             }
                          }
                        else
                          {
                           break;
                          }
                       }
                    }
                 }
               else
                 {
                  break;
                 }
              }
           }
        }
     }
   DrawLines();
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void DrawLines()
  {
   int oneup;

   ArraySort(levels,WHOLE_ARRAY,0,MODE_ASCEND);

   for(int i=0;i<ArraySize(levels)-1;i++)
     {
      if(levels[i]>Bid)
        {
         oneup=i;
         break;
        }
     }
   if(oneup<=0)
      oneup=ArraySize(levels)-1;

   ObjectCreate(0,"SR1",OBJ_HLINE,0,iTime(Symbol(),0,0),levels[oneup+2]);
   ObjectCreate(0,"SR2",OBJ_HLINE,0,iTime(Symbol(),0,0),levels[oneup+1]);
   ObjectCreate(0,"SR3",OBJ_HLINE,0,iTime(Symbol(),0,0),levels[oneup]);
   ObjectCreate(0,"SR4",OBJ_HLINE,0,iTime(Symbol(),0,0),levels[oneup-1]);
   ObjectCreate(0,"SR5",OBJ_HLINE,0,iTime(Symbol(),0,0),levels[oneup-2]);
   ObjectCreate(0,"SR6",OBJ_HLINE,0,iTime(Symbol(),0,0),levels[oneup-3]);
  }
//+------------------------------------------------------------------+

 Thanks!

Richard