MAC-LT Indicator bars

[gpmtrader@xxxxxxxxxxxxxx (Gerald Marisch)]

I use an Indicator called the "MAC-LT", adapted from Gerald Appel's  MACD
Indicator.

The Histogram bars are now of one color, regardless if they 
are above (BULL market) or below (BEAR market) the "0" line.

I would like to change this so that histogram bars appearing "above" the
"0" line (positive values for a BULL trend) appear green and those
appearing "below" the "0" line (negative values for a BEAR trend) appear
red.

Colors of course have no bearing on the mathematical signals of the MAC-LT
- colors just make the MAC-LT look prettier!

Thanks in advance to anyone for their help and timely reply

Gerald Marisch