INDESIGN resize an image. problem

Hello,
I am working with InDesign on a document that will contain images.
I import the images using the (shortcut) ctrl D function.
The problem is that the image is too large, so when I try to resize it, the image block reduces but not the content of the image itself. I end up with an image block of the desired size, but with the image contained inside it cropped. I would like to reduce the image itself to the desired size.
Am I proceeding the right way? I don't see how else to do it...

Thank you in advance.

Configuration: Windows XP Firefox 2.0.0.18