var currImg = 1;



function animateBackground() {

  var divClassName = "content_startseite";     

  var currClassName = document.getElementById("news_container").className;    

  var newClassName = divClassName + currImg++;

  document.getElementById("news_container").className = newClassName;

  

  if (currImg <= 7) {

  

  } else {

    currImg = 1;

  }

      

  setTimeout("animateBackground()",5000);  

}