Copying a column list from one sheet to another and repeating???

Hi

Does anyone know how to copy a list of text in a column from one sheet and
display it in another sheet but then continue to repeat the original list?

I am trying to get the content from these cells to be displayed in a row of
cells but
the crucial thing is that I need the cells to repeat the list from the
beginning once a blank cell is reached in the original column. I'll try an
example to make this clearer...

1. There is Sheet A with column A1:A20 containing the names of 20 products.
2. There is Sheet B with row A1:AN1 containing 40 cells

In this example Sheet B should copy all the 20 product names then get to
cell 21 and find a blank cell at 'Sheet1:A21' so start the list from the
beginning again. This should occur no matter how many cells are calling the
original list of 20 products but as soon as it finds a blank cell at the end
of the list of 20 products it should go back to the beginning and start
displaying from cell 1. Please note that there should be no limit on the
number of cells in the original product list and the cells displaying the
copied list should be able to be displayed in any row on sheet 2.

Hopefully I've made it easier to understand and not harder. Any ideas would
be much appreciated.

Thanks
Simon