execute script in certain directory

[brad]

When I use idle or a shell to execute a python script, the script 
executes in the directory it is currently in (in this case, my desktop). 
However, when using GNOME and right clicking the py script and selecting 
'open with python', the execution occurs in my home directory, not my 
desktop.

Is there a way to force py scripts to always run within the directory 
that they reside in?

Thanks

Brad

/home/brad/Desktop/output - python from shell
/home/brad/Desktop/output - python from idle
/home/brad/output - python from Gnome 'right click' open with menu