Selecting values from adjacent rows

Hi,

I have 2 rows:
Row1: each column has the date (e.g. dd/mm)
Row2: each column has a numeric value e.g. 272)

I want to in another cell do the following.

a. Search Row1 to find a date equal to todays date.
b. Then select the matching value from Row2 and place that in my cell.
or if it cant find todays date then it should take the value from the previous cell (date).

ie. Row1: 04/11 05/11 06/11 07/11 09/11
Row2: 345 340 335 320 305

If todays 06/11 then it must return 335 to my cell. If today is 08/11 it must return 320 into my cell.

Please assist with this comulation.

Thanks