(document.layers) ? layerobject=true : layerobject=false;
	(document.all) ? allobject = true: allobject = false;
	(document.getElementById) ? dom = true : dom = false;
	
	
	function showThisLayer(id)
	{
	if (currentLayer != '') 
	{
	changeVisibility(currentLayer,'hide');
	changeVisibility(id,'show');
	} else {
	changeVisibility(id,'show');
	}
	currentLayer = id;
	window.scroll(0,1000);
	return;}
	
	
	function changeVisibility(id,action)
	{
	switch (action)
	{
	case "show":
	if (layerobject)
	document.layers[''+id+''].visibility = "show";
	else if (allobject)
	document.all[''+id+''].style.display = "block";
	else if (dom)
	document.getElementById(''+id+'').style.display = "block";
	break;
	case "hide":
	if (layerobject)
	document.layers[''+id+''].visibility = "hide";
	else if (allobject)
	document.all[''+id+''].style.display = "none";
	else if (dom)
	document.getElementById(''+id+'').style.display = "none";
	break;
	default:return;
	}
	return;}