thumbnail cropping…

Hi, I want to use a featured image on my front page but don’t want it to be cropped through the middle.
I’ve found this fix:
1 $s_x = floor( ($orig_w – $crop_w) / 2 );
2 $s_y = floor( ($orig_h – $crop_h) / 2 );
change to:
1 $s_y = 0; //floor( ($orig_h – $crop_h) / 2 );

But that meant that the featured image top showed and not the bottom. Also, in other parts of the blog my comics also lost the bottom.

I’d like for the featured image to have no crop at all, any ideas?
thank you,
Heather