[amibroker] please write this stoploss

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i have been asking for help to write a stoploss for 6 months but i don't 
get any
reply i am requesting expert to help me
initail stoploss is 2% but when my profit goes 4% stoploss  should move 
to breakeven buyprice
example if i buy a stock at 100 my initial stoploss is at 98 so when 
prices goes above 4% stop loss
should move at 100

buy=cross macd, sell =cross signal
nitail stoploss is 2% but when prices up 4% stoploss move to breakeven 
buyprice
*Buy* = Cross( MACD(), Signal() );
*Sell* = Cross( Signal(), MACD() );