Remove faint line around images

Hi Sakin, is there any custom CSS code to remove the very faint grey/gray line that, somehow, is present when you insert an image? The image(s) I want to use will have no links attached to them. I've tried 'border=0' but it makes no difference. A link as an example - the welcome image has a faint border... http://www.classicalballetcentresurrey.co.uk.gridhosted.co.uk/ Thanks for your help!