The method getrows returns an array of grid cells of selected columns. The arguments are the index numbers of the selected columns.
var pggrid = new jsgrid();
pggrid.init({
id:"wrp",
rows:5,
columns:12,
width:25,
height:20,
gutter:1,
backgroundColor: "#7fffd4"
});
var cols = pggrid.getcolumns(0,2,4,6,8,10);
pggrid.setbackgroundcolor(cols,"#bbff00");