Help!! I need a picture to show in a spreadsheet based on a cell value!

I have a spreadsheet that I need for a picture to display on based on a cell's value. There are only 2 pics that can show. I have an excel sheet that I've names Pic Table and posted the bitmap pics on, I've named a range of cells that the pics are located in on the sheet, I've written a "choose"formula in a cell that will be hidden under the displayed picture, but I cannot figure out how to actually make the picture display. Help!!??