PHP Thumbnail Script Change. Very, very Small project.

My website allows a person to upload a photo. When they upload it, sometimes it uploads in upper case and the resulting file has the file extension .JPG My thumbnail script will not show this file as a thumbnail. If I change the file to lower case it appears correctly. I realize this can be corrected by changing the main upload script, but I have thousands of photos with the upper case file extension. Below is my thumbnail code. If you can add a line of code to make it show the images with the upper case .JPG extension, I will send you $15.00 right away. The fix MUST work before we complete the project. Please be fast and honest. I have a good rating and you should too.