Images Displayed In Table Cells

I need to fill a four column by five row HTML table with images to be displayed over a background image.

The sequence is

1. fill the top row, one column at a time, and display with a 1/2 second interval between each insertion,

2. once the top row is filled, proceed to the next row, then

3. fill the remaining three rows.

The twenty images will be numbered 01 through 20, and accessible from an "image" folder.

Any help will be appreciated.

 

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The delay will have to happen on the client side- that means you'll need to use javascript.