How to collor certain areas of a chart

Hi guys, I am doing a breakeven analysis and would like to paint certain areas of my chart. I want the profit area in blue and the loss area in red (loss area is the area to the left of the breakeven intersection; profit area is the area to the right of the breakeven intersection). Could you let me know how I could do this? I have attached the spreadsheet I am working on.

I have the Excel 2007 version but saved as and uploaded a 2003 version for those who don't have the latest one.

Thank you very much for your help!

Marcus