Help with custom color to a script?

I did a custom script for a column chart to see monthly performance of sectors.
But, I would like greater than 0 to be green, and below 0 to be red.
CHANGE(month(PERIODAMOUNT=1), INT_TYPE=Bars, INT_COUNT=1) is the script I used.
How do I add colors to this?

Any help will be much appreciated.

Thanks Matt. In column charts the colours can only be changed for separate scripts. So in this case you would have to add two scripts - one for positive and one for negative, as per this example for YTD% (workbook attached):

//Positive YTD;
V1 = ROC(Year(PERIODAMOUNT=1), BARS=1);
IF(V1>0, V1, 0)
//Negative YTD; 
V1 = ROC(Year(PERIODAMOUNT=1), BARS=1);
IF(V1<0, V1, 0)

Column.owb (5.93 KB)