AJAX and PHP question

[black-ops]

I am experimenting with AJAX and have a table set up with a drop down.
The table is filled from a database handled by the php upon the state of a GET.
I wish to change the GET in the url upon changing the selection from a drop down. How would I go about sending a request to the server to change the GET in the url to update the table without completely refreshing the page?

Regards,

 

[black-ops]

Well it was more an idea of seeing how I could update the page table content upon changing the drop down. Either through PHP or AJAX but I thought AJAX would be the best choice.