Images with no border

Hi there, This is my website (not officially 'launched' yet): http://www.sebastiaanhorn.nl/sponsors/dh2tx2013/ As you can see there's a border around all my images. In the settings of the pictures I already typed: border: 0. For example: a href="http://www.sebastiaanhorn.nl/wp-content/uploads/2013/06/Speedo-Logo.jpg" target="_blank"><img class="alignnone size-medium wp-image-149" style="border: 0px;" alt="Speedo-Logo" src="http://www.sebastiaanhorn.nl/wp-content/uploads/2013/06/Speedo-Logo-300x64.jpg" width="300" height="64" How do I get rid of the borders?