IE4 = (document.all) ? 1 : 0;
NS6 = (document.getElementById) ? 1 : 0;



function set_Layer(layername){

	theImage = layername;

	if (document.images[theImage].src.match('mid2'))
	{
		document.images[theImage].src = 'http://www.cwclan.de/infusions/mumbleview_panel/images/list_tree_mid3.gif';
	} 
	else if (document.images[theImage].src.match('mid3'))
	{
		document.images[theImage].src = 'http://www.cwclan.de/infusions/mumbleview_panel/images/list_tree_mid2.gif';
	} 
	else if (document.images[theImage].src.match('end2'))
	{
		document.images[theImage].src = 'http://www.cwclan.de/infusions/mumbleview_panel/images/list_tree_end3.gif';
	} 
	else if (document.images[theImage].src.match('end3'))
	{
		document.images[theImage].src = 'http://www.cwclan.de/infusions/mumbleview_panel/images/list_tree_end2.gif';
	} 

	theLayer = layername;
	if(IE4) {
		theStatus = document.all(theLayer).style.display;
		if (theStatus == 'none') {
			document.all(theLayer).style.display = "inline"; }
		else {
			document.all(theLayer).style.display = "none";} }
	if(NS6) {
		theStatus = document.getElementById(theLayer).style.display;
		if (theStatus == 'none') {
			document.getElementById(theLayer).style.display = "inline"; }
		else {
			document.getElementById(theLayer).style.display = "none"; } } }