Sending Radio Button Value Using Ajax To Get Php File To Retrieve Data From Mysql

I want to be able to write a few mysql queries with the returned value(s) of my radio button(s). Here is the code I have

Solution 1:

Change

xmlhttp.open("GET","getuser.php?=q"+str,true);

to

xmlhttp.open("GET","getuser.php?q="+str,true);

The q and = are the wrong way around ;)