Portal Component Image changes doesn't reflect.

Hi All,
In our portal component (Par file) we have set of images.
The application is all working fine with the images.
Later as per requirement we changes the images to stylish icons, replaced these images in our parfile with the same names and uploaded the par file back into portal.
even after clearing all the cache in System Admin, deleting cookies in IE etc the images are not getting reflected in our application, it still displays the old images.
If we use a new image (with new file name) in the par file this is rendered in the application but not the new image with the old file name.
do we need to delete any existing versions of the par file in portal to take the changes.
Thanks & regards,
Sai

we just renamed all the images and then their referenc in the par file.
this did works but couldn't find the reason & solution why it was not working with the old names.

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