Help with the 'display_files_for_item' function

I have a collection of some .swf files that I want to display. While uploading the .swf files, I also upload the .jpeg file to upload the thumbnail of the flash file. The problem is that when I display the item using the fuction 'display_files_for_item()', alongwith the .swf file it also displays the image thumbnail on the 'show' page. Can someone help me modify the function such that I can omit the thumbnail on the 'show' page. Thanks in advance for your help