Notice: Undefined index:

[tny5357]

I am getting the "Notice: Undefined index:" error when referencing a $GET variable

i use $_GET['module'] as a switch in a big if-elseif-else statement

 if ($_GET['module'] == 'module') { 
    Do this. 
} elseif ($_GET['module'] == 'module') { 
    Do this.
} else { 
    Do this. 
}  

like so, i also did a test to make sure $GET was set and it was, i played around in the php.ini file, messing with the register globals and register long arrays, and both are set to off currently, i just realized im getting this same error when i call a $POST variable

please help me its rather urgent

win2K advanced server/iis5/php5

[scrupul0us]

how about testing with

exists($GET_['module'])

and see what you get... if the $GET variable doesnt exist youll get that error