function background()
    {
      var willekeurig;
     /* willekeurig = 1;*/
     willekeurig = Math.floor(Math.random()*11);
     
     
      switch (willekeurig)
      {
      case 1:
          /*document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop1.jpg) fixed no-repeat center right";*/
          document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop5.jpg) fixed no-repeat center right";
      break;
      case 2:
            document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop3.jpg) fixed no-repeat bottom right";        
      break;
      case 3:
            document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop11.jpg) fixed no-repeat center center";
         
      break;
      case 4:
            document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop3.jpg) fixed no-repeat center right";
       
      break;
      case 5:
            /*document.getElementById("achtergrond").style.background="url(http://localhost/kgl/modules/editorial/slider/images/backdrop5.jpg) fixed no-repeat center center";*/
            document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop11.jpg) fixed no-repeat center right";
      break;
      case 6:
            document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop5.jpg) fixed no-repeat top left";
        
      break;
      case 7:
           /* document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop7.jpg) fixed no-repeat bottom center";*/
           document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop3.jpg) fixed no-repeat bottom right";
        
      break;
      case 8:
            document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop11.jpg) fixed no-repeat top center";
         
      break;
     /* case 9:
            document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop9.jpg) fixed no-repeat bottom right";
       
      break;
      case 10:
            document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop10.jpg) fixed no-repeat center right";
         
      break;
      */
      default:
            /*document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop1.jpg) fixed no-repeat center right";*/
            document.getElementById("achtergrond").style.background="url(http://www.tommygrass.de/Images/backdrop5.jpg) fixed no-repeat center right";
      }
     /* document.body.style.background.position="fixed";*/
      
   
    }