function ShowHideBlock(nr,va)
// va = "don"    display on
// va = "doff"   display off
// va = "visoff" unsichtbar
// va=  "vison"  sichtbar
//
// ShowHideBlock(1,"don")
// ShowHideBlock(1,"doff")
// ShowHideBlock(1,"visoff")
// ShowHideBlock(1, "vison" )

{
  if(document.getElementById)
  {
    obj=document.getElementById("bild"+nr);
  }
  if(document.all && !document.getElementById)
  {
    obj=document.all["bild"+nr];
  }


  if(va=="doff")
  {
    obj.style.display="none";
    
  }
  else if(va=="don")
  {
    obj.style.display="block";
    
  }
  if(va=="visoff")
  {
    obj.style.visibility="hidden";
  
  }
  else if(va=="vison")
  {
    obj.style.visibility="visible";

  }
}
//#####################################################
function hideall()
{
ShowHideBlock(1, 'visoff' );
ShowHideBlock(2, 'visoff' );
ShowHideBlock(3, 'visoff' );
ShowHideBlock(4, 'visoff' );
ShowHideBlock(5, 'visoff' );

}