Using data grids in delphi 8 web apps

[minckle]

hi this might be hard to explain but ill try
i have a web page containing 3 data grids
1. listing some group names
2. listing all my contacts
3. listing the contacts which belong to the selected group

then i have 2 buttons
1. to add a contact to a group
2 to remove a contact from a group

i want to be able to click on a group then click on a contact in grid2 and then click Add to add the selected contact to the selected group

and

i want to be able to click a group then click a contact in grid 3 and then click remove to remove the contact from the group.

if this was a normal windows app i would store the id's of the group and contact and then run a query

What is the best way to store the selected group id and the selectd contact id when your dealing with web pages?????

Thanks