Exclude post image

Is there any way to not show an image which is in a post on the post page? as i am using the timthumb script to crop the image on the page, but i am using <?php echo getImage(); ?> Is there a way to either exclude the image generated through the_content(); or a way to add the timthumb options to the image it posts.

I don’t want to use the excerpt text field as i want to keep the options to edit the text and other things.