[amibroker] Simple Code Difficulty

[abramway]

I'd just like to be able to get signals for 

Buy: When EMA(5)>EMA(20) AND Stock @ Fresh 20-Day Highs.
Exit: When EMA(20)>EMA(5) OR Stock @ Fresh 10-Day Lows (haven't incorporated 
the second part yet)

This is what my code reads now and its giving me the wrong signals.  It gives 
me BUY signals before a new 20-Day high.

Buy =   EMA(  Close , 5 ) > EMA(  Close , 20 ) 
        AND High > Ref( HHV(  High , 20 ) , -20 );

Sell =  EMA(  Close , 20 ) > EMA(  Close , 5 );

Short = 0;

Cover = 0;


Thanks for the help