function changeDisplay(klasse_alt)
{
  var obj=getElementsByClassName(klasse_alt);

  for(i=0;i<obj.length;i++)
  {
    obj[i].style.display = 'block';
  }
  window.print();
}

function getElementsByClassName(class_name)
      {
        var all_obj,ret_obj=new Array(),j=0,teststr;

        if(document.all)all_obj=document.all;
        else if(document.getElementsByTagName && !document.all)
          all_obj=document.getElementsByTagName("*");

        for(i=0;i<all_obj.length;i++)
        {
          if(all_obj[i].className.indexOf(class_name)!=-1)
          {
            teststr=","+all_obj[i].className.split(" ").join(",")+",";
            if(teststr.indexOf(","+class_name+",")!=-1)
            {
              ret_obj[j]=all_obj[i];
              j++;
            }
          }
        }
        return ret_obj;
      }