Need help auto refreshing filterxml... Anyone???

trying to create a button/macro to switch a column of cells from

=FILTERXML(WEBSERVICE("http://api.eve-central.com/api/marketstat?usesystem=30000142&typeid="&a2),"/evec_api/marketstat/type/buy/max")

to

=FILTERXML(WEBSERVICE("http://api.eve-central.com/api/marketstat?usesystem=30000142&typeid="&a2),"/evec_api/marketstat/type/sell/min")

without having to manually put it in, also is there a way to auto refresh

=FILTERXML(WEBSERVICE("http://api.eve-central.com/api/marketstat?usesystem=30000142&typeid="&a2),"/evec_api/marketstat/type/buy/volume")

without having to take it out and put it back in?????

Thanks

cell g2/h2...etc contains the Id number of the items im pulling data for such as

trit=1230 so in g2 i would have 1230

Do you have a e-mail where i can send you the sheet and you can walk me throu hwo to do it?

awsome now how would i do that to use a2-a57 with all different id's?