function layerswap(layername){
	var targetEl = document.getElementById('dynamictest');
	var scrollDiv = document.getElementById('mycustomscroll');
  if(document.getElementById(layername)){
    if (document.getElementById(layername).style.visibility=='visible'){
      document.getElementById(layername).style.visibility='hidden';
      document.getElementById(layername).style.display='none';
    }else{
      document.getElementById(layername).style.visibility='visible';
      document.getElementById(layername).style.display='block';
    }
  }
  	if(scrollDiv && scrollDiv.scrollUpdate) scrollDiv.scrollUpdate();
}

function secondarylayerswap(layername, vis){
  if (!vis) vis = 'block';
  if(document.getElementById(layername)){
    if (document.getElementById(layername).style.visibility=='visible'){
      document.getElementById(layername).style.visibility='hidden';
      document.getElementById(layername).style.display='none';
    }else{
      document.getElementById(layername).style.visibility='visible';
      document.getElementById(layername).style.display=vis;
    }
  }
}