Dynamically return the background color of a cell

I need to dynamically identify what the background color of a cell is.

For example, loop through all rows - If the cell in the first column has a blue background, I'd like to add that cell's value to a JavaScript array.

Any ideas?

I finally was able to fingure this out (I opted for getting the background color of the row, instead of the cell):

SETTING THE BACKGROUND COLOR:
obj.getRowTemplate(x).setStyle("background", "#DDDDDD");

GETTING THE BACKGROUND COLOR:
obj.getRowTemplate(x).getStyle("background")

where x is the row index. ("undefined" is returned for any row for which the background color is not explicitly set using the setStyle method).