problems with several JPEGs in GD2

Hi, PHP 4.3.10, GD2 I've noticed that there is a group of JPEG files that cannot be operated with GD2 functions. For example, if you try to imagecreatefromjpeg("my.jpg") it replies: Warning: imagecreatefromjpeg(): 'my.jpg' is not a valid JPEG file in C:\Program Files\Apache Group\Apache2\htdocs\test.php on line 20 (this is not a scripting error, it works with lots of other jpegs) Meanwhile the same my.jpg file can be shown in web browser by HTML tag <img src="my.jpg">, can be opened in PhotoShop.. and other programs.. But GD2 thinks that it is not a valid JPEG.. Any suggestions how to deal with these types of JPEGs in GD2? Any workaround? Thanks, Mario