Forum:Moving images

Hello. I've added images to my timeline, but for some reason, I can't move them around. When I press 'Edit this page', add an image, and try to move it up or down, the screen scrolls up so I can't move it. When I press 'Preview' and try to move an image, the screen scrolls down so I can't move it. Thus I can't really position my images well. I add images by pressing that button with the single image, when you hold your mouse on it, it says 'Add a picture'. Can anyone help me?

Thanks in advance.