is case sensitive Submit needs to be submit (something I missed) replace your function with:
alert ('the value you selected is ' + (document.Report_Drive.drive.value));
/* here is the function you may want to ensure a selection is made
alert("You must make a selection to proceed");
Also replace the method in the form tag to "post"
I have to go now. i hope you get this resolved I have run your function, it works.
Wind is your friend