You can find out what RAM is compatible with most boards at
www.crucial.com.
Here's a link straight to the results page for the mobo you specified:
http://www.crucial.com/store/listparts.asp?Mfr+Productline=ASUS++Motherb
oards&mfr=ASUS&cat=RAM&model=A7A266&submit=Go
If you want the prices in something other than dollars you have to change to
one of their 'international' sites.
Apparently your board will take 1GB PC3200 DDR. Which is nice.