function showMainLayer(id)
{
  var ids = new Array()
  ids['main_layer'] = 0
  ids['gz_layer'] = 1
  ids['th_layer'] = 2
  ids['um_layer'] = 3
  ids['tt_layer'] = 4
  ids['fi_layer'] = 5
  ids['im_layer'] = 6
  var bp = '0px -' + (ids[id] * 1024) + 'px';
  document.getElementById('main_layer').style.backgroundPosition = bp;
 // for(i=0;i<ids.length;i++)
 // {
 // 	if(document.getElementById(ids[i])!=null){
 //   document.getElementById(ids[i]).style.z-index=0
//  }
 // }
 // document.getElementById(id).style.z-index=100 = 'block'
}

function showKlappe(id)
{
  var ids = new Array()
  ids['main_layer'] = 0
  ids['gz_layer'] = 1
  ids['th_layer'] = 2
  ids['um_layer'] = 3
  ids['tt_layer'] = 4
  ids['fi_layer'] = 5
  ids['im_layer'] = 6
  var bp = '0px -' + (ids[id] * 280) + 'px';
  document.getElementById('main_layer').style.backgroundPosition = bp;
 // for(i=0;i<ids.length;i++)
 // {
 // 	if(document.getElementById(ids[i])!=null){
 //   document.getElementById(ids[i]).style.z-index=0
//  }
 // }
 // document.getElementById(id).style.z-index=100 = 'block'
}

function ShowHide(id) {
    obj = document.getElementsByTagName("div");
    if (obj[id].style.visibility == 'visible'){
    obj[id].style.visibility = 'hidden';
    }
    else {
    obj[id].style.visibility = 'visible';
    }
}